Update to use new preferred envvar to control protocol version

[ajgajg1134]

Motivation

NodeJS already uses this envvar, let's align on the same name instead of introducing a new one.

Changes

DD_TRACE_AGENT_PROTOCOL_VERSION is now the envvar to choose a different protocol version

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

utils/_context/_scenarios/__init__.py                                   @DataDog/system-tests-core

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

❄️ 2 New flaky tests detected

tests.debugger.test_debugger_probe_snapshot.Test_Debugger_Method_Probe_Snaphots_With_SCM.test_log_method_snapshot[uds-spring-boot] from system_tests_suite (Datadog) (Fix with Cursor)

AssertionError: assert 'Snapshot was not received' is None
 +  where 'Snapshot was not received' = <built-in method join of str object at 0x7f7c84e2aa60>(['Snapshot was not received'])
 +    where <built-in method join of str object at 0x7f7c84e2aa60> = '\n'.join
 +    and   ['Snapshot was not received'] = <tests.debugger.test_debugger_probe_snapshot.Test_Debugger_Method_Probe_Snaphots_With_SCM object at 0x7f7c76cf0fb0>.setup_failures

self = <tests.debugger.test_debugger_probe_snapshot.Test_Debugger_Method_Probe_Snaphots_With_SCM object at 0x7f7c76cf0fb0>

    def test_log_method_snapshot(self):
>       self._assert()

...

tests.test_ipv6.Test_Basic.test_main[apache-mod-8.0-zts] from system_tests_suite (Datadog) (Fix with Cursor)

ValueError: No trace has been found for request VZFUMZOGUTZOBQKRLXZEIQMVSUIBILAFOAMW

self = <tests.test_ipv6.Test_Basic object at 0x7f9ff0f4d6a0>

    def test_main(self):
>       interfaces.agent.assert_trace_exists(self.r)

tests/test_ipv6.py:11: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

...

ℹ️ Info

🧪 All tests passed

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