ci(appsec): skip pygoat tests because they are failing on main

[emmettbutler]

These tests recently started failing reliably on the main branch, so they're skipped here to keep CI unblocked.

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.

Reviewer Checklist

• Title is accurate
• All changes are related to the pull request's stated goal
• Description motivates each change
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Change is maintainable (easy to change, telemetry, documentation)
• Release note makes sense to a user of the library
• 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: emmett.butler/pygoat-failures
Commit report: c899816
Test service: dd-trace-py

✅ 0 Failed, 144831 Passed, 34121 Skipped, 7h 39m 57.33s Total duration (1h 55m 39.6s time saved)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 10.27%. Comparing base (844117e) to head (c899816).
Report is 8 commits behind head on main.

Files	Patch %	Lines
...ts/appsec/integrations/pygoat_tests/test_pygoat.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #9507       +/-   ##
===========================================
- Coverage   75.88%   10.27%   -65.61%     
===========================================
  Files        1315     1285       -30     
  Lines      124706   123109     -1597     
===========================================
- Hits        94633    12650    -81983     
- Misses      30073   110459    +80386     

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