Tests

Add DateIntervalFormatDynamicReturnTypeExtension #21755

Job	Run time
Integration tests (windows-latest)	16s
Integration tests (ubuntu-latest)	18s
Determine levels tests matrix	13s
Tests (8.3, ubuntu-latest)	14s
Tests (8.4, ubuntu-latest)	27s
Tests (8.2, ubuntu-latest)	12s
Tests (8.3, windows-latest)	12s
Tests (8.4, windows-latest)	14s
Tests (8.2, windows-latest)	16s
Tests with old PHPUnit (7.4, windows-latest)	15s
Tests with old PHPUnit (7.4, ubuntu-latest)	12s
Tests with old PHPUnit (8.0, ubuntu-latest)	13s
Tests with old PHPUnit (8.1, ubuntu-latest)	12s
Tests with old PHPUnit (8.1, windows-latest)	16s
Tests with old PHPUnit (8.0, windows-latest)	15s
Levels tests	1s
	3m 46s

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