Tests

Implement @pure-unless-callable-impure #21908

Job	Run time
Integration tests (ubuntu-latest)	19s
Integration tests (windows-latest)	1m 9s
Tests (8.2, windows-latest)	1m 0s
Determine levels tests matrix	19s
Tests (8.5, ubuntu-latest)	26s
Tests with old PHPUnit (8.0, windows-latest)	2m 53s
Tests (8.3, ubuntu-latest)	21s
Tests (8.5, windows-latest)	1m 8s
Tests (8.2, ubuntu-latest)	18s
Tests with old PHPUnit (7.4, ubuntu-latest)	5m 42s
Tests with old PHPUnit (8.0, ubuntu-latest)	1m 38s
Tests with old PHPUnit (7.4, windows-latest)	12m 38s
Tests with old PHPUnit (8.1, ubuntu-latest)	1m 36s
Tests with old PHPUnit (8.1, windows-latest)	2m 59s
Tests (8.4, ubuntu-latest)	19s
Tests (8.4, windows-latest)	1m 12s
Tests (8.3, windows-latest)	1m 2s
Levels tests	0s
	34m 59s

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