fix(internal): improve performance of package resolution [backport #12327 to 2.19]

[P403n1x87]

Backport 0c7fc1b from #12327 to 2.19.

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/fix-internal-packages-perf-c270b1ff7e68b46a.yaml     @DataDog/apm-python
.gitlab/benchmarks.yml                                                  @DataDog/python-guild @DataDog/apm-core-python
ddtrace/internal/packages.py                                            @DataDog/apm-core-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-21 10:42:36

Comparing candidate commit c99dda8 in PR branch backport-12327-to-2.19 with baseline commit 0629245 in branch 2.19.

Found 3 performance improvements and 0 performance regressions! Performance is the same for 377 metrics, 2 unstable metrics.

scenario:iast_aspects-ospathbasename_aspect

• 🟩 execution_time [-378.482ns; -320.369ns] or [-10.516%; -8.901%]

scenario:iast_aspects-ospathdirname_aspect

• 🟩 execution_time [-390.906ns; -327.692ns] or [-9.584%; -8.035%]

scenario:iast_aspects-split_aspect

• 🟩 execution_time [-156.487ns; -129.705ns] or [-8.546%; -7.084%]

[github-actions]

The backport to 2.19 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.19 2.19
# Navigate to the new working tree
cd .worktrees/backport-2.19
# Create a new branch
git switch --create backport-12463-to-2.19
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 dd4f3b5c3a3d8d9049ff2441fe931cef04070f52
# Push it to GitHub
git push --set-upstream origin backport-12463-to-2.19
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.19

Then, create a pull request where the base branch is 2.19 and the compare/head branch is backport-12463-to-2.19.