Run unit tests on Windows

`composer.json` tweaks #6596

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Job	Run time
Generate Chunk Matrix	2s
Unit Tests - 1	4m 45s
Unit Tests - 2	5m 37s
Unit Tests - 3	2m 42s
Unit Tests - 4	4m 30s
Unit Tests - 5	5m 19s
Unit Tests - 6	2m 41s
Unit Tests - 7	4m 41s
Unit Tests - 8	4m 40s
	34m 57s