WIP: Add HTML templating #29157

Job	Run time
Determine Matrix	4s
Multisite Memcached / Test before	13m 47s
Single Site Default / Test before	12m 29s
Multisite Default / Test before	12m 53s
Multisite Memcached / Test current	12m 22s
Single Site Memcached / Test current	13m 17s
Single Site Default / Test current	12m 32s
Multisite Default / Test current	12m 30s
Single Site Memcached / Test before	13m 4s
Compare / Multisite Default	18s
Compare / Single Site Default	15s
Slack Notifications	0s
Compare / Single Site Memcached	15s
Compare / Multisite Memcached	17s
Failed workflow tasks	0s
	1h 44m 3s

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