fix: Log warnings to the stderr #32286

Job	Run time
Avoid duplicate short class names	22s
Finalize classes	20s
Compatible PHPStan versions	16s
Preload php-parser Order	18s
Composer Validate	19s
Run with Space in Directory	18s
Detect composer dependency issues	17s
Check fixture classes are different to nodes	19s
PHPStan	56s
Check no "*.php" files in rules Fixture directory	18s
Active Classes	23s
Commented Code	19s
PHP Linter	23s
Help and Version	19s
Check before/after test fixture on no-changes	21s
	5m 28s

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