fix(iast): fix leak on slice aspect. Add cleanup code to the trycatch macro

[juanjux]

Description

• Fix a memory leak on slice_aspect.
• Add a parameter to the TRY_CATCH_ASPECT macro to optionally add cleanup code to the exception handlers.

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/slice-aspect-leak-95e264c4f1aa851c.yaml              @DataDog/apm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/AspectIndex.cpp            @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/AspectModulo.cpp           @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/AspectOperatorAdd.cpp      @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/AspectSlice.cpp            @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/AspectsOsPath.cpp          @DataDog/asm-python
ddtrace/appsec/_iast/_taint_tracking/Aspects/Helpers.h                  @DataDog/asm-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: juanjux/august-leak-hunt
Commit report: 8d548d9
Test service: dd-trace-py

✅ 0 Failed, 112898 Passed, 3999 Skipped, 56m 55.97s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-30 12:49:33

Comparing candidate commit 8d548d9 in PR branch juanjux/august-leak-hunt with baseline commit 5b394f1 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 353 metrics, 47 unstable metrics.