Fix `RemoveDuplicatedCaseInSwitchRector` behavior #29989

Job	Run time
PHPStan	1m 21s
Check before/after test fixture on no-changes	26s
Check no "*.php" files in rules Fixture directory	16s
Help and Version	40s
Finalize classes	22s
Detect composer dependency issues	21s
Run with Space in Directory	26s
Composer Validate	23s
Commented Code	20s
Active Classes	21s
Preload php-parser Order	22s
Compatible PHPStan versions	22s
	5m 40s

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