fix(ci_visibility): handle PYTEST_ADDOPTS for enabling code coverage collection [backport 3.9]

[github-actions]

Backport b0c1496 from #13820 to 3.9.

This fix resolves an issue where code coverage would not be enabled if ddtrace was enabled via the PYTEST_ADDOPTS environment variable.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, 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

[github-actions]

CODEOWNERS have been resolved as:

releasenotes/notes/ci_visibility-fix-pytest-addopts-early-init-74fb4e207dee18e4.yaml  @DataDog/apm-python
tests/contrib/pytest/test_pytest_early_config.py                        @DataDog/ci-app-libraries
ddtrace/contrib/internal/pytest/_plugin_v1.py                           @DataDog/ci-app-libraries
ddtrace/contrib/internal/pytest/_plugin_v2.py                           @DataDog/ci-app-libraries
ddtrace/contrib/internal/pytest/_utils.py                               @DataDog/ci-app-libraries
tests/contrib/pytest/test_pytest.py                                     @DataDog/ci-app-libraries

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 275 ± 3 ms.

The average import time from base is: 277 ± 3 ms.

The import time difference between this PR and base is: -2.4 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.010 ms (0.73%)

ddtrace.bootstrap.sitecustomize 1.331 ms (0.48%)

ddtrace.bootstrap.preload 1.331 ms (0.48%)

ddtrace.internal.remoteconfig.client 0.638 ms (0.23%)

ddtrace 0.678 ms (0.25%)

ddtrace.internal._unpatched 0.032 ms (0.01%)

json 0.032 ms (0.01%)

json.decoder 0.032 ms (0.01%)

re 0.032 ms (0.01%)

enum 0.032 ms (0.01%)

types 0.032 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-07-01 14:22:14

Comparing candidate commit 1b97eac in PR branch backport-13820-to-3.9 with baseline commit ee1aabe in branch 3.9.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 549 metrics, 3 unstable metrics.

scenario:iastaspectsospath-ospathbasename_aspect

• 🟥 execution_time [+550.826ns; +784.565ns] or [+13.371%; +19.045%]

scenario:iastaspectsospath-ospathnormcase_aspect

• 🟥 execution_time [+413.449ns; +500.018ns] or [+12.053%; +14.577%]

scenario:iastaspectsospath-ospathsplitdrive_aspect

• 🟥 execution_time [+527.738ns; +577.794ns] or [+14.275%; +15.629%]

scenario:iastaspectsospath-ospathsplitext_aspect

• 🟥 execution_time [+712.372ns; +816.337ns] or [+15.658%; +17.943%]