fix(bootstrap): add missing icon styles mixin #5105

Job	Run time
Status check > Unit	1s
CI \| Unit	1s
CI \| Visual	1s
Render test pages / verify	8s
Lint scripts / run	45s
Compile themes / run	40s
Lint styles / run (default)	1m 21s
Lint styles / run (bootstrap)	1m 26s
Lint styles / run (material)	1m 30s
Lint styles / run (classic)	1m 24s
Lint styles / run (fluent)	1m 8s
Render test pages / run	0s
Status check > A11y / prepare	1s
Create screenshots / run (default)	2m 13s
Create screenshots / run (bootstrap)	2m 48s
Create screenshots / run (material)	2m 38s
Create screenshots / run (classic)	2m 33s
Create screenshots / run (fluent)	2m 28s
Status check > Lint scripts	1s
Status check > A11y / run-checks (1)	2m 58s
Status check > A11y / run-checks (2)	2m 24s
Status check > A11y / run-checks (3)	2m 34s
Status check > A11y / run-checks (4)	2m 33s
Status check > Lint styles	1s
Detect changes	12s
Status check > Visual	1s
	31m 50s

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