[cleanup] cleanup AbstractRector from DONT_TRAVERSE_* enums as no longer supported, all rules work without it now #31649

Job	Run time
Run with Space in Directory	20s
Composer Validate	30s
Preload php-parser Order	24s
Help and Version	31s
Finalize classes	30s
Compatible PHPStan versions	21s
Check before/after test fixture on no-changes	29s
PHPStan	1m 26s
Commented Code	16s
Check fixture classes are different to nodes	22s
Detect composer dependency issues	20s
Active Classes	41s
Check no "*.php" files in rules Fixture directory	29s
PHP Linter	28s
	7m 7s

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