Tests

Add `@implements` to SPL iterator stubs #29322

Job	Run time
Integration tests (windows-latest)	1m 58s
Determine levels tests matrix	41s
Tests PHPUnit 11.x (8.2, windows-latest)	1m 35s
Tests PHPUnit 11.x (8.2, ubuntu-latest)	47s
Integration tests (ubuntu-latest)	47s
Tests PHPUnit 12.x (8.3, ubuntu-latest)	42s
Tests PHPUnit 12.x (8.5, windows-latest)	1m 43s
Tests with old PHPUnit (8.0, windows-latest)	2m 37s
Tests with old PHPUnit (8.0, ubuntu-latest)	1m 10s
Tests PHPUnit 12.x (8.4, ubuntu-latest)	47s
Tests with old PHPUnit (7.4, windows-latest)	1m 52s
Tests PHPUnit 12.x (8.3, windows-latest)	1m 37s
Tests PHPUnit 12.x (8.5, ubuntu-latest)	48s
Tests with old PHPUnit (7.4, ubuntu-latest)	56s
Tests with old PHPUnit (8.1, windows-latest)	3m 4s
Tests with old PHPUnit (8.1, ubuntu-latest)	1m 11s
Tests PHPUnit 12.x (8.4, windows-latest)	1m 32s
Levels tests	0s
Mutation Testing	0s
	23m 47s

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