Admin: Update styling of buttons and form elements to match the WordPress Design Library #21139

Job	Run time
Determine Matrix	4s
Single Site Default / Test before	14m 4s
Single Site Default / Test current	13m 38s
Multisite Default / Test before	13m 22s
Multisite Default / Test current	13m 10s
Single Site Memcached / Test before	13m 13s
Single Site Memcached / Test current	13m 20s
Multisite Memcached / Test before	14m 5s
Multisite Memcached / Test current	13m 42s
Slack Notifications	0s
Compare / Single Site Memcached	10s
Compare / Multisite Default	19s
Compare / Single Site Default	11s
Failed workflow tasks	0s
Compare / Multisite Memcached	9s
	1h 49m 27s

Provide feedback