chore(html): reuse helpers in tests #3319

Job	Run time
Status check > Unit	1s
CI \| Unit	1s
CI \| Visual	1s
Compile themes / run	36s
Lint scripts / run	1m 9s
Lint styles / run (default)	2m 14s
Render test pages / verify	7s
Lint styles / run (bootstrap)	2m 17s
Lint styles / run (material)	2m 15s
Lint styles / run (classic)	2m 16s
Lint styles / run (nouvelle)	48s
Lint styles / run (fluent)	40s
Render test pages / run	2m 12s
Status check > Lint scripts	1s
Status check > Lint styles	1s
Status check > A11y / prepare	1s
Create screenshots / run (default)	2m 33s
Create screenshots / run (bootstrap)	2m 28s
Create screenshots / run (material)	2m 29s
Create screenshots / run (classic)	2m 28s
Create screenshots / run (nouvelle)	1m 52s
Create screenshots / run (fluent)	2m 27s
Status check > A11y / run-checks (1)	2m 58s
Status check > A11y / run-checks (2)	2m 29s
Status check > A11y / run-checks (3)	2m 59s
Status check > A11y / run-checks (4)	3m 14s
Detect changes	16s
Status check > Visual	1s
	40m 54s

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