fix: Makes the test agent report version 7.65.0 for client side stats

[bric3]

Motivation

Makes test agent report version 7.65.0, fix for

• Only enable client side stats if the host agent is at least 7.65.0 dd-trace-java#10041

Uses

• Allow parametric test to set agent env #5820

Changes

Workflow

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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

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🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, 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 (or removed)?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

tests/parametric/test_library_tracestats.py                             @DataDog/system-tests-core @DataDog/apm-sdk-capabilities
tests/parametric/test_span_sampling.py                                  @DataDog/system-tests-core @DataDog/apm-sdk-capabilities

[amarziali]

LGTM. It would be interesting, as a follow up, to add a specific test for the contrary (e.g. not activating CSS for previous version of the agent)

Need to progress on this I'll fix back the tests if something need to be fixed.