Introduce FileNode to handle file-level changes #31719

Job	Run time
Composer Validate	20s
Run with Space in Directory	22s
Compatible PHPStan versions	16s
Preload php-parser Order	19s
PHPStan	1m 54s
Active Classes	19s
Finalize classes	28s
Help and Version	29s
Check before/after test fixture on no-changes	18s
Commented Code	24s
Detect composer dependency issues	20s
Check no "*.php" files in rules Fixture directory	19s
PHP Linter	31s
Check fixture classes are different to nodes	19s
	6m 38s

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