Clean up copy paste fixture source unused #31943

Job	Run time
Commented Code	32s
Composer Validate	16s
PHPStan	1m 29s
Run with Space in Directory	19s
Preload php-parser Order	17s
Compatible PHPStan versions	16s
Detect composer dependency issues	23s
Check before/after test fixture on no-changes	17s
Active Classes	26s
Check no "*.php" files in rules Fixture directory	20s
Help and Version	17s
Finalize classes	31s
Check fixture classes are different to nodes	23s
PHP Linter	31s
	6m 17s

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