refactor(profiling): fork handling

[morrisonlevi]

Description

This refactors the fork handling of profiler. This is roughly an extraction of work that was done in #2714 but not yet merged. That PR has conflicts to fix anyway, so may as well pull out the unrelated refactoring.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-07-05 17:57:08

Comparing candidate commit be85648 in PR branch levi/fork-refactor with baseline commit ec095eb in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 27 metrics, 9 unstable metrics.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.51%. Comparing base (ec095eb) to head (be85648).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2747      +/-   ##
============================================
+ Coverage     77.95%   79.51%   +1.55%     
  Complexity     2216     2216              
============================================
  Files           227      201      -26     
  Lines         26637    22612    -4025     
  Branches        989        0     -989     
============================================
- Hits          20765    17980    -2785     
+ Misses         5346     4632     -714     
+ Partials        526        0     -526     

Flag	Coverage Δ
appsec-extension	?
tracer-extension	78.80% <ø> (ø)
tracer-php	80.54% <ø> (ø)

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see 26 files with indirect coverage changes

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