fix(bootstrap): add missing icon styles mixin #5110

Job	Run time
Status check > Unit	1s
CI \| Visual	1s
CI \| Unit	1s
Lint scripts / run	44s
Render test pages / verify	10s
Compile themes / run	41s
Lint styles / run (default)	1m 20s
Lint styles / run (bootstrap)	1m 31s
Lint styles / run (material)	1m 26s
Lint styles / run (classic)	1m 28s
Lint styles / run (fluent)	1m 6s
Render test pages / run	0s
Status check > A11y / prepare	1s
Create screenshots / run (default)	2m 15s
Create screenshots / run (bootstrap)	2m 11s
Create screenshots / run (material)	2m 30s
Create screenshots / run (classic)	2m 15s
Create screenshots / run (fluent)	2m 22s
Status check > Lint scripts	1s
Status check > A11y / run-checks (1)	2m 28s
Status check > A11y / run-checks (2)	2m 20s
Status check > A11y / run-checks (3)	2m 23s
Status check > A11y / run-checks (4)	2m 53s
Status check > Lint styles	1s
Detect changes	10s
Status check > Visual	1s
	30m 20s

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