[DeadCode] Add RemoveUselessUnionReturnDocblockRector (#8126) #33039

Job	Run time
Run with Space in Directory	16s
Avoid duplicate short class names	16s
Commented Code	17s
Compatible PHPStan versions	14s
Check fixture classes are different to nodes	17s
Help and Version	19s
Check no "*.php" files in rules Fixture directory	21s
Composer Validate	15s
PHP Linter	27s
Check before/after test fixture on no-changes	19s
Preload php-parser Order	19s
Finalize classes	18s
Active Classes	24s
Run StructArmed	19s
Validate rule definitions	23s
PHPStan	54s
	5m 38s

Provide feedback