convert libbeat system pprof tests to go

[leehinman]

Proposed commit message

• Converts the Python system tests in libbeat/tests/system/test_http_pprof.py to Go integration tests in libbeat/tests/integration/pprof_test.go
• Deletes the original Python test file
• New tests follow the established patterns in libbeat/tests/integration/http_test.go using the BeatProc framework

The following test cases are preserved 1:1 from the Python originals:

Test	Endpoint	Expected
TestHttpPProfIndex	GET /debug/pprof/	200
TestHttpPProfCmdline	GET /debug/pprof/cmdline	200
TestHttpPProfNotFound	GET /debug/pprof/not-exist	404

This will eventually allow us to remove Python from test env.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

None. Test code

Author's Checklist

How to test this PR locally

cd libbeat
mage goIntegTest

Related issues

• Relates Replace Python system tests with Go tests #48850

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 882c812 and 9012903.

📒 Files selected for processing (2)

• libbeat/tests/integration/pprof_test.go
• libbeat/tests/system/test_http_pprof.py

💤 Files with no reviewable changes (1)

• libbeat/tests/system/test_http_pprof.py

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📝 Walkthrough

Walkthrough

The pull request migrates HTTP pprof endpoint tests from a Python-based system test to Go-based integration tests. The Python system test file is removed, and a new Go integration test file is added with three tests that verify pprof endpoint behavior: testing successful responses on /debug/pprof/ and /debug/pprof/cmdline endpoints, and verifying 404 responses for non-existent endpoints. Both old and new tests follow the same validation approach with mockbeat instance startup and HTTP status code assertions.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

📝 Coding Plan

• Generate coding plan for human review comments

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[orestisfl]

Fine to merge as is but all three tests could be merged into one test with 3 subtests and share the same mockbeat process.