Remove variable `orderless-skip-highlighting` #114

Job	Run time
test (ubuntu-latest, 27.2)	1m 7s
test (ubuntu-latest, 28.1)	58s
test (ubuntu-latest, snapshot)	50s
test (macos-latest, 27.2)	3m 27s
test (macos-latest, 28.1)	56m 31s
test (macos-latest, snapshot)	2m 42s
test (windows-latest, 27.2)	1m 26s
test (windows-latest, 28.1)	54s
test (windows-latest, snapshot)	1m 18s
	1h 9m 13s

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