Handle crash redeclare isPHPStanTestPreloaded() function #30912

Job	Run time
Commented Code	19s
Run with Space in Directory	23s
Composer Validate	25s
Preload php-parser Order	21s
Check before/after test fixture on no-changes	25s
Active Classes	30s
Help and Version	27s
Check no "*.php" files in rules Fixture directory	24s
Finalize classes	25s
PHPStan	1m 23s
Detect composer dependency issues	1m 34s
Compatible PHPStan versions	24s
PHP Linter	30s
	7m 30s

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