Do not run CLEAN
section of PHPT test in separate process when it is free of side effects that modify the parent process
#5999
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Don't use subprocess for
—CLEAN—
as long as the code cannot modify the parent process (e.g. file IO is fine within the parent process).utilizes https://github.com/staabm/side-effects-detector
followup to #5998
php phpunit tests/end-to-end/event/phpt-clean.phpt
before this PR 109-110ms
after this PR: 85-87ms
tested on PHP 8.3.12 macos m1 pro