[internal] Add AbstractLeaveNode for move duplicated code of leaveNode() method #31486

Job	Run time
PHPStan	1m 31s
Preload php-parser Order	23s
Help and Version	20s
Run with Space in Directory	19s
Composer Validate	22s
Commented Code	27s
Detect composer dependency issues	19s
Check fixture classes are different to nodes	23s
Compatible PHPStan versions	21s
PHP Linter	28s
Active Classes	26s
Finalize classes	23s
Check before/after test fixture on no-changes	19s
Check no "*.php" files in rules Fixture directory	21s
	6m 22s

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