chore(ci_visibility): gate coverage-related checks to ITR-supported versions

[romainkomorndatadog]

Internal coverage use for pytest only applies to ITR, so we introduce a function to check whether the pytest version supports ITR, and configure the plugin and hooks accordingly.

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.

Reviewer Checklist

• Title is accurate
• All changes are related to the pull request's stated goal
• Description motivates each change
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Change is maintainable (easy to change, telemetry, documentation)
• Release note makes sense to a user of the library
• Author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: romain.komorn/CIVIS-9428/support_pytest_lt_5.1
Commit report: 4ddb047
Test service: dd-trace-py

✅ 0 Failed, 174698 Passed, 1149 Skipped, 11h 22m 41.76s Total duration (26m 37.21s time saved)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 15.38462% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 10.26%. Comparing base (66b96e9) to head (4ddb047).
Report is 9 commits behind head on main.

Files	Patch %	Lines
ddtrace/contrib/pytest/_plugin_v1.py	0.00%	12 Missing ⚠️
ddtrace/contrib/pytest/utils.py	30.00%	7 Missing ⚠️
ddtrace/contrib/pytest/plugin.py	33.33%	2 Missing ⚠️
ddtrace/contrib/pytest/constants.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #9363       +/-   ##
===========================================
- Coverage   76.02%   10.26%   -65.77%     
===========================================
  Files        1294     1267       -27     
  Lines      122816   121232     -1584     
===========================================
- Hits        93370    12441    -80929     
- Misses      29446   108791    +79345     

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[romainkomorndatadog]

Side note, this is not a "fix" because the issue this PR fixes (compatibility with pytest < 5.something) was introduced in #8727 which has yet to be released.