Revert "[NodeTypeResolver] Apply logic Mixed inside Union check on TypeFactory::uniquateTypes()" #30578

Job	Run time
Composer Validate	23s
Run with Space in Directory	21s
Preload php-parser Order	17s
PHPStan	1m 22s
Compatible PHPStan versions	21s
Check before/after test fixture on no-changes	19s
Finalize classes	25s
Detect composer dependency issues	23s
Active Classes	19s
Check no "*.php" files in rules Fixture directory	18s
Help and Version	19s
Commented Code	24s
	5m 11s

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