chore(html): reuse helpers in tests #3325

Job	Run time
Status check > Unit	1s
CI \| Unit	1s
CI \| Visual	1s
Render test pages / verify	6s
Lint scripts / run	1m 0s
Lint styles / run (default)	2m 12s
Compile themes / run	39s
Lint styles / run (bootstrap)	2m 15s
Lint styles / run (material)	2m 12s
Lint styles / run (classic)	2m 11s
Lint styles / run (nouvelle)	48s
Lint styles / run (fluent)	39s
Render test pages / run	1m 58s
Status check > Lint scripts	1s
Status check > A11y / prepare	1s
Create screenshots / run (default)	2m 46s
Create screenshots / run (bootstrap)	2m 22s
Create screenshots / run (material)	2m 25s
Create screenshots / run (classic)	2m 31s
Create screenshots / run (nouvelle)	2m 10s
Create screenshots / run (fluent)	2m 21s
Status check > Lint styles	1s
Status check > A11y / run-checks (1)	2m 35s
Status check > A11y / run-checks (2)	2m 48s
Status check > A11y / run-checks (3)	2m 22s
Status check > A11y / run-checks (4)	2m 42s
Detect changes	16s
Status check > Visual	1s
	39m 25s

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