fix(iast): backport fix from 10706 to 2.11

[juanjux]

Description

Partial backport of the Initializer atexit fix from #10706.

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: juanjux/backport-10706-to-211
Commit report: 654a88a
Test service: dd-trace-py

✅ 0 Failed, 109912 Passed, 3979 Skipped, 5m 20.91s Total duration (32m 55.99s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-09-20 09:35:54

Comparing candidate commit 654a88a in PR branch juanjux/backport-10706-to-211 with baseline commit c0a9375 in branch 2.11.

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