Introduce FileNode to handle file-level changes #31744

Job	Run time
Run with Space in Directory	20s
Commented Code	23s
Preload php-parser Order	24s
Composer Validate	25s
PHPStan	1m 33s
Help and Version	24s
Compatible PHPStan versions	25s
Check before/after test fixture on no-changes	20s
Check fixture classes are different to nodes	19s
Check no "*.php" files in rules Fixture directory	21s
PHP Linter	33s
Finalize classes	27s
Detect composer dependency issues	18s
Active Classes	24s
	6m 36s

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