chore(generator): use {% set %} to extract repeated logic in conditionals

packages/gapic-generator/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2

@@ -1,13 +1,14 @@
 {% extends '_base.py.j2' %}
-
 {% block content %}
+{% set has_auto_populated_fields = api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+
 {% import "%namespace/%name/%version/%sub/services/%service/_shared_macros.j2" as shared_macros %}
 
 from collections import OrderedDict
 import os
 import re
 from typing import Callable, Dict, Mapping, MutableMapping, MutableSequence, Optional, {% if service.any_server_streaming %}Iterable, {% endif %}{% if service.any_client_streaming %}Iterator, {% endif %}Sequence, Tuple, Type, Union, cast
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 import uuid
 {% endif %}
 {% if service.any_deprecated %}

packages/gapic-generator/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2

@@ -1,10 +1,12 @@
 {% extends "_base.py.j2" %}
-
 {% block content %}
+{% set has_auto_populated_fields = api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+
+
 {% import "%namespace/%name/%version/%sub/services/%service/_shared_macros.j2" as shared_macros %}
 
 import os
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 import re
 {% endif %}
 from unittest import mock
@@ -70,7 +72,7 @@ from google.iam.v1 import policy_pb2  # type: ignore
 {% endfilter %}
 {{ shared_macros.add_google_api_core_version_header_import(service.version) }}
 
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|list %}
+{% if has_auto_populated_fields %}
 _UUID4_RE = re.compile(r"{{ uuid4_re }}")
 {% endif %}
 

packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2

@@ -1,14 +1,14 @@
 {% extends "_base.py.j2" %}
-
 {% block content %}
+{% set has_auto_populated_fields = api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
 {% import "%namespace/%name_%version/%sub/services/%service/_client_macros.j2" as macros %}
 {% import "%namespace/%name_%version/%sub/services/%service/_shared_macros.j2" as shared_macros %}
 
 import logging as std_logging
 from collections import OrderedDict
 import re
 from typing import Dict, Callable, Mapping, MutableMapping, MutableSequence, Optional, {% if service.any_server_streaming %}AsyncIterable, Awaitable, {% endif %}{% if service.any_client_streaming %}AsyncIterator, {% endif %}Sequence, Tuple, Type, Union
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 import uuid
 {% endif %}
 {% if service.any_deprecated %}

packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2

@@ -1,8 +1,8 @@
-{# TODO(https://github.com/googleapis/gapic-generator-python/issues/2121): Remove the following variable (and the condition later in this file) for async rest transport once support for it is GA. #}
-{% set rest_async_io_enabled = api.all_library_settings[api.naming.proto_package].python_settings.experimental_features.rest_async_io_enabled %}
 {% extends '_base.py.j2' %}
-
 {% block content %}
+{# TODO(https://github.com/googleapis/gapic-generator-python/issues/2121): Remove the following variable (and the condition later in this file) for async rest transport once support for it is GA. #}
+{% set rest_async_io_enabled = api.all_library_settings[api.naming.proto_package].python_settings.experimental_features.rest_async_io_enabled %}
+{% set has_auto_populated_fields = api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
 {% import "%namespace/%name_%version/%sub/services/%service/_client_macros.j2" as macros %}
 {% import "%namespace/%name_%version/%sub/services/%service/_shared_macros.j2" as shared_macros %}
 
@@ -16,7 +16,7 @@ import logging as std_logging
 import os
 import re
 from typing import Dict, Callable, Mapping, MutableMapping, MutableSequence, Optional, {% if service.any_server_streaming %}Iterable, {% endif %}{% if service.any_client_streaming %}Iterator, {% endif %}Sequence, Tuple, Type, Union, cast
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 import uuid
 {% endif %}
 import warnings
@@ -453,7 +453,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
         # NOTE (b/349488459): universe validation is disabled until further notice.
         return True
 
-    {% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+    {% if has_auto_populated_fields %}
+
     @staticmethod
     def _setup_request_id(request, field_name: str, is_proto3_optional: bool):
         """Populate a UUID4 field in the request if it is not already set.

packages/gapic-generator/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2

@@ -1,14 +1,14 @@
-{# TODO(https://github.com/googleapis/gapic-generator-python/issues/2121): Remove the following variable (and the condition later in this file) for async rest transport once support for it is GA. #}
-{% set rest_async_io_enabled = api.all_library_settings[api.naming.proto_package].python_settings.experimental_features.rest_async_io_enabled %}
 {% extends "_base.py.j2" %}
-
 {% block content %}
+{# TODO(https://github.com/googleapis/gapic-generator-python/issues/2121): Remove the following variable (and the condition later in this file) for async rest transport once support for it is GA. #}
+{% set rest_async_io_enabled = api.all_library_settings[api.naming.proto_package].python_settings.experimental_features.rest_async_io_enabled %}
+{% set has_auto_populated_fields = api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
 {% import "tests/unit/gapic/%name_%version/%sub/test_macros.j2" as test_macros %}
 {% import "%namespace/%name_%version/%sub/services/%service/_shared_macros.j2" as shared_macros %}
 
 import os
 import asyncio
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 import re
 {% endif %}
 from unittest import mock
@@ -107,7 +107,7 @@ CRED_INFO_JSON = {
     "principal": "service-account@example.com",
 }
 CRED_INFO_STRING = json.dumps(CRED_INFO_JSON)
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 _UUID4_RE = re.compile(r"{{ uuid4_re }}")
 {% endif %}
 
@@ -434,7 +434,7 @@ def test__add_cred_info_for_auth_errors_no_get_cred_info(error_code):
     client._add_cred_info_for_auth_errors(error)
     assert error.details == []
 
-{% if api.all_method_settings.values()|map(attribute="auto_populated_fields", default=[])|select|list %}
+{% if has_auto_populated_fields %}
 def test__setup_request_id():
     class MockRequest:
         def __init__(self, **kwargs):