Introduce FileNode to handle file-level changes #31818

Job	Run time
Preload php-parser Order	19s
Help and Version	25s
PHPStan	1m 37s
Check fixture classes are different to nodes	22s
Composer Validate	18s
PHP Linter	27s
Run with Space in Directory	22s
Commented Code	19s
Compatible PHPStan versions	22s
Check no "*.php" files in rules Fixture directory	22s
Active Classes	20s
Detect composer dependency issues	22s
Finalize classes	24s
Check before/after test fixture on no-changes	16s
	6m 15s

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