fix(prof) FrankenPHP idle phase

[realFlowControl]

Description

This PR fixes FrankenPHP idle phase detection in worker mode. Turns out, that frankenphp_handle_request() does also execute the closure given to it, so the current way of measuring the idle phase in worker mode is incorrect. So what I am doing now instead of hooking frankenphp_handle_request() is hooking into sapi_module.activate/ sapi_module.deactivate in case the detected SAPI is FrankenPHP. If one of those functions is being called while frankenphp_handle_request() is the current execute frame, we are indeed in the idle phase.

Why does this work?

FrankenPHP in frankenphp_worker_request_shutdown() calls into sapi_deactivate() and in frankenphp_worker_request_startup() it calls into sapi_activate().

There is also a small cleanup: I have extracted the idle phase start and stop code into their own functions.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.07%. Comparing base (f115837) to head (f23afb5).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3169      +/-   ##
============================================
- Coverage     79.09%   79.07%   -0.02%     
  Complexity     2890     2890              
============================================
  Files           114      114              
  Lines         11443    11443              
============================================
- Hits           9051     9049       -2     
- Misses         2392     2394       +2     

Flag	Coverage Δ
tracer-php	79.07% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes

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[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2025-04-01 11:49:31

Comparing candidate commit f23afb5 in PR branch florian/fix-frankenphp-workermode-idle with baseline commit f115837 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 29 metrics, 7 unstable metrics.

[bwoebi]

Looks great to me :-)