Tests: Various harness improvements, especially on Windows #726

Job	Run time
code-quality / Lint Gherkin Feature files	17s
code-quality / PHPStan	21s
code-quality / Lint GitHub Actions workflows	10s
code-quality / Spell check	4s
code-quality / Lint PHP files	15s
code-quality / PHPCS	20s
	1m 27s

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