fix(ci_visibility): support pytest 8.0.0 [backport 2.6]

[github-actions]

Backport 78d5b98 from #8357 to 2.6.

Addresses #8220 and fixes an issue with pytest 8.x and above
(brought by pytest-dev/pytest#11137 ) where pytest.Package objects no longer have an attached module attribute.

This also changes the testing matrix to include version ~=8.0, but maintains ~=7.0 as a separate testing environment.

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.
• If change touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.

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: backport-8357-to-2.6
Commit report: 2ebae09
Test service: dd-trace-py

✅ 0 Failed, 171460 Passed, 1015 Skipped, 11h 53m 29.16s Total duration (34m 40.9s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-21 17:58:31

Comparing candidate commit 2ebae09 in PR branch backport-8357-to-2.6 with baseline commit d3c559b in branch 2.6.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 194 metrics, 9 unstable metrics.

scenario:flasksimple-debugger

• 🟩 execution_time [-379.591µs; -331.635µs] or [-5.711%; -4.989%]