Add unit tests for save_mod_rewrite_rules() in src/wp-admin/includes/… #35447

Job	Run time
Determine Matrix	3s
Single Site Default / Test current	14m 3s
Multisite Default / Test current	14m 53s
Single Site Memcached / Test current	14m 10s
Single Site Memcached / Test before	14m 42s
Multisite Default / Test before	14m 12s
Multisite Memcached / Test before	13m 46s
Multisite Memcached / Test current	14m 9s
Single Site Default / Test before	14m 7s
Compare / Multisite Memcached	16s
Compare / Single Site Default	12s
Compare / Single Site Memcached	11s
Compare / Multisite Default	12s
Slack Notifications	-1s
Failed workflow tasks	-1s
	1h 54m 54s

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