Add Stack Trace reporting for AppSec actions

[y9v]

What does this PR do?
This PR adds Stack Trace reporting to the Datadog Agent in case of an AppSec event with generate_stack action.

Motivation:
We are not handling generate_stack action yet.

Change log entry
Yes. AppSec: Add stack trace reporting for security events.

Additional Notes:
None.

How to test the change?
CI and local testing with app-generator (SSRF or SQLi variants).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.74%. Comparing base (7d88b81) to head (bf5323c).
Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4526      +/-   ##
==========================================
+ Coverage   97.70%   97.74%   +0.04%     
==========================================
  Files        1381     1388       +7     
  Lines       83973    84487     +514     
  Branches     4251     4272      +21     
==========================================
+ Hits        82043    82579     +536     
+ Misses       1930     1908      -22     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: appsec-stack-trace-reporting
Commit report: bf5323c
Test service: dd-trace-rb

✅ 0 Failed, 20677 Passed, 1374 Skipped, 3m 15.21s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-19 16:48:18

Comparing candidate commit bf5323c in PR branch appsec-stack-trace-reporting with baseline commit 7d88b81 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[vpellan]

I think that other than the env vars defaults, it's good to go !

[Strech]

Well done 👍🏼

I've left a few non-blocking suggestions