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 Tests failed

tests.test_v1_payloads.Test_V1Payloads.test_field_changes[net-http] from system_tests_suite (Datadog) (Fix with Cursor)

AssertionError: assert False
 +  where False = isinstance([{'duration': 1098521, 'error': 1, 'meta': {'_dd.appsec.event_rules.version': '1.15.1', '_dd.appsec.fp.http.endpoint':... 'hdr-0010000000-b81f317e-1-4740ae63', '_dd.appsec.fp.http.network': 'net-0-0000000000', ...}, 'meta_struct': {}, ...}], dict)
 +    where [{'duration': 1098521, 'error': 1, 'meta': {'_dd.appsec.event_rules.version': '1.15.1', '_dd.appsec.fp.http.endpoint':... 'hdr-0010000000-b81f317e-1-4740ae63', '_dd.appsec.fp.http.network': 'net-0-0000000000', ...}, 'meta_struct': {}, ...}] = <utils.dd_types._datadog_library_trace.DataDogLibraryTraceLegacy object at 0x7f4c1bb02ff0>.raw_trace

self = <tests.test_v1_payloads.Test_V1Payloads object at 0x7f4c187fef00>

    def test_field_changes(self):
        library_traces = list(interfaces.library.get_traces(self.r))
        agent_traces = list(interfaces.agent.get_traces(self.r))
        assert len(library_traces) == 1
...

tests.test_v1_payloads.Test_V1Payloads.test_field_changes[net-http-orchestrion] from system_tests_suite (Datadog) (Fix with Cursor)

AssertionError: assert False
 +  where False = isinstance([{'duration': 1144536, 'error': 1, 'meta': {'_dd.appsec.event_rules.version': '1.15.1', '_dd.appsec.fp.http.endpoint':... 'hdr-0010000000-0cf252a1-1-4740ae63', '_dd.appsec.fp.http.network': 'net-0-0000000000', ...}, 'meta_struct': {}, ...}], dict)
 +    where [{'duration': 1144536, 'error': 1, 'meta': {'_dd.appsec.event_rules.version': '1.15.1', '_dd.appsec.fp.http.endpoint':... 'hdr-0010000000-0cf252a1-1-4740ae63', '_dd.appsec.fp.http.network': 'net-0-0000000000', ...}, 'meta_struct': {}, ...}] = <utils.dd_types._datadog_library_trace.DataDogLibraryTraceLegacy object at 0x7fd71230b0e0>.raw_trace

self = <tests.test_v1_payloads.Test_V1Payloads object at 0x7fd70af9e9f0>

    def test_field_changes(self):
        library_traces = list(interfaces.library.get_traces(self.r))
        agent_traces = list(interfaces.agent.get_traces(self.r))
        assert len(library_traces) == 1
...

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
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