Introduce FileNode to handle file-level changes #31809

Job	Run time
Commented Code	18s
Composer Validate	19s
Preload php-parser Order	23s
Run with Space in Directory	20s
Check before/after test fixture on no-changes	21s
PHPStan	1m 32s
Active Classes	20s
Check fixture classes are different to nodes	25s
Compatible PHPStan versions	24s
Help and Version	28s
Finalize classes	24s
Check no "*.php" files in rules Fixture directory	18s
PHP Linter	31s
Detect composer dependency issues	17s
	6m 20s

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