chore: remove .Owlbot-hermetic.yaml (#13600)

Author: zhumin8

.github/release-note-generation/split_release_note.py

@@ -63,29 +63,16 @@ def detect_modules(root_directory: Path):
 
         module_path = repo_metadata_path.parent
         module_pom_xml = module_path / 'pom.xml'
-        owlbot_yaml_path = module_path/ '.OwlBot-hermetic.yaml'
         if not module_pom_xml.exists():
             continue
         tree = ET.parse(module_pom_xml)
         root = tree.getroot()
         version = root.find('mvn:version', POM_NAMESPACES).text
         api_name = None
-        if owlbot_yaml_path.exists():
-            # If OwlBot configuration file exists (most cases), it's the better
-            # source to get the OwlBot-generated pull request title prefix than
-            # the repo-metadata.json
-            with open(owlbot_yaml_path, 'r') as file:
-                owlbot_yaml_content = file.read()
-                match = re.search(r'api-name: (.+)', owlbot_yaml_content)
-                if match:
-                    api_name = match.group(1)
-
-        if not api_name:
-            # Fallback to repo-metadata.json (e.g. for vertexai or Spanner transitional state)
-            if repo_metadata_path.exists():
-                with open(repo_metadata_path, 'r') as file:
-                    repo_metadata = json.load(file)
-                    api_name = repo_metadata.get('api_shortname')
+        if repo_metadata_path.exists():
+            with open(repo_metadata_path, 'r') as file:
+                repo_metadata = json.load(file)
+                api_name = repo_metadata.get('api_shortname')
 
         if api_name:
             modules.append(LibraryModule(module_path, api_name,
@@ -94,7 +81,6 @@ def detect_modules(root_directory: Path):
         else:
             raise Exception(f'Could not determine api-name for {repo_metadata_path}')
 
-
     return modules