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Run setup commands in a single process in tests #510

Job	Run time
code-quality / Audit locked dependencies	4s
code-quality / PHPCS	16s
code-quality / PHPStan	26s
code-quality / Lint Gherkin Feature files	20s
code-quality / Spell check	8s
code-quality / Lint PHP files	14s
code-quality / Lint GitHub Actions workflows	8s
	1m 36s