Add unit tests for got_mod_rewrite() in src/wp-admin/includes/misc.php #35508

Job	Run time
Determine Matrix	4s
Single Site Default / Test current	14m 6s
Single Site Memcached / Test before	13m 54s
Multisite Default / Test before	14m 24s
Single Site Memcached / Test current	14m 15s
Multisite Default / Test current	14m 3s
Single Site Default / Test before	13m 47s
Multisite Memcached / Test before	13m 59s
Multisite Memcached / Test current	13m 58s
Compare / Single Site Default	18s
Compare / Multisite Default	18s
Compare / Single Site Memcached	12s
Slack Notifications	0s
Compare / Multisite Memcached	17s
Failed workflow tasks	0s
	1h 53m 35s

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