Introduce FileNode to handle file-level changes #31745

Job	Run time
Run with Space in Directory	18s
Preload php-parser Order	25s
PHPStan	1m 25s
Composer Validate	24s
Help and Version	25s
Commented Code	31s
Active Classes	20s
Finalize classes	26s
Compatible PHPStan versions	27s
Check no "*.php" files in rules Fixture directory	25s
Check before/after test fixture on no-changes	21s
Check fixture classes are different to nodes	22s
PHP Linter	29s
Detect composer dependency issues	27s
	6m 45s

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