bpf recorder: track child pids on clone()

[mhils]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR ensures that spoc traces child processes after clone().

Which issue(s) this PR fixes:

None

Does this PR have test?

(will get tested transitively further down the line)

Special notes for your reviewer:

Broken out of #2623 to make that one more manageable.

Does this PR introduce a user-facing change?

spoc now correctly tracks child processes that `clone()`.

[k8s-ci-robot]

Hi @mhils. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.42%. Comparing base (11d77f4) to head (308a32a).
Report is 584 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2644      +/-   ##
==========================================
- Coverage   45.50%   41.42%   -4.08%     
==========================================
  Files          79      109      +30     
  Lines        7782    18225   +10443     
==========================================
+ Hits         3541     7550    +4009     
- Misses       4099    10175    +6076     
- Partials      142      500     +358     

[ccojocar]

@mhils This needs some formatting fix.

[mhils]

Fixed, thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccojocar, mhils

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