fix(profiling): better autoinject detection [backport 2.11]

[github-actions]

Backport d638a7b from #9904 to 2.11.

PROF-10280

Previously, Profiling was injecting its own configuration during lib-injection handling. This was actually a little brittle.

Instead, we move to a model where the profiler detects (in its normal configuration) whether the library was injected. Hopefully this is more durable and correct.

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

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: backport-9904-to-2.11
Commit report: f1630a7
Test service: dd-trace-py

✅ 0 Failed, 118436 Passed, 60014 Skipped, 3h 39m 19.33s Total duration (5h 33m 47.84s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-07 14:31:00

Comparing candidate commit 3c944c5 in PR branch backport-9904-to-2.11 with baseline commit fea19c5 in branch 2.11.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 214 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 10.55%. Comparing base (9c353ce) to head (3c944c5).
Report is 2 commits behind head on 2.11.

Files	Patch %	Lines
ddtrace/settings/profiling.py	0.00%	19 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             2.11   #10119       +/-   ##
===========================================
- Coverage   34.18%   10.55%   -23.64%     
===========================================
  Files        1385     1381        -4     
  Lines      129280   129237       -43     
===========================================
- Hits        44191    13636    -30555     
- Misses      85089   115601    +30512     

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[github-actions]

CODEOWNERS have been resolved as:

releasenotes/notes/profiling-fix-autoinject-detection-fa5035fb0c4719cc.yaml  @DataDog/apm-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/Dockerfile     @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/Readme.md      @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/addressbook_pb2.py  @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/requirements.txt  @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/test.py        @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-protobuf-old/validate_telemetry.py  @DataDog/apm-core-python
.github/workflows/lib-inject-prune.yml                                  @DataDog/python-guild @DataDog/apm-core-python
.gitlab-ci.yml                                                          @DataDog/apm-core-python
ddtrace/settings/profiling.py                                           @DataDog/profiling-python
lib-injection/sitecustomize.py                                          @DataDog/apm-core-python
pyproject.toml                                                          @DataDog/python-guild
tests/.suitespec.json                                                   @DataDog/python-guild @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-django-unsupported-package-force/Dockerfile  @DataDog/apm-core-python
tests/lib-injection/dd-lib-python-init-test-django/Dockerfile           @DataDog/apm-core-python