Tests

Fix missing detection of dead code in expressions #21543

Job	Run time
Tests (8.2, ubuntu-latest)	37s
Tests with old PHPUnit (8.0, windows-latest)	28s
Integration tests (ubuntu-latest)	39s
Tests (8.4, ubuntu-latest)	39s
Tests with old PHPUnit (8.0, ubuntu-latest)	34s
Tests with old PHPUnit (8.1, windows-latest)	28s
Tests (8.4, windows-latest)	28s
Tests (8.2, windows-latest)	28s
Determine levels tests matrix	33s
Tests (8.3, windows-latest)	29s
Integration tests (windows-latest)	28s
Tests with old PHPUnit (7.4, windows-latest)	28s
Tests with old PHPUnit (7.4, ubuntu-latest)	39s
Tests (8.3, ubuntu-latest)	41s
Tests with old PHPUnit (8.1, ubuntu-latest)	30s
Levels tests	1s
	8m 10s

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