Tests: Add missing `@covers` tags for some rewrite tests. #56289

Job	Run time
Coding standards / JavaScript checks	1m 38s
Coding standards / PHP checks	1m 16s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	5s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	-1s
Slack Notifications / Cancelled notifications	-1s
Failed workflow tasks	0s
	3m 3s

Provide feedback