Introduce FileNode to handle file-level changes #31710

Job	Run time
Composer Validate	26s
Help and Version	25s
Preload php-parser Order	25s
PHPStan	1m 26s
Run with Space in Directory	52s
Active Classes	28s
Compatible PHPStan versions	20s
Commented Code	24s
Finalize classes	24s
Check fixture classes are different to nodes	23s
Check before/after test fixture on no-changes	19s
Detect composer dependency issues	45s
Check no "*.php" files in rules Fixture directory	18s
PHP Linter	27s
	7m 22s

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