[fixture] add enum case to StringClassNameToClassConstantRector #31642

Job	Run time
Help and Version	57s
Commented Code	24s
Run with Space in Directory	18s
Composer Validate	19s
Preload php-parser Order	26s
Active Classes	22s
Compatible PHPStan versions	23s
Finalize classes	31s
Check before/after test fixture on no-changes	20s
Check fixture classes are different to nodes	30s
Detect composer dependency issues	17s
PHP Linter	30s
Check no "*.php" files in rules Fixture directory	18s
PHPStan	1m 29s
	7m 4s

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