fix(tabstrip): center content in stretched horizontal tabs #5325

Job	Run time
Status check > Unit	1s
CI \| Visual	1s
CI \| Unit	1s
Compile themes / run	45s
Lint scripts / run	44s
Render test pages / verify	7s
Lint styles / run (default)	1m 14s
Lint styles / run (bootstrap)	1m 12s
Lint styles / run (material)	1m 6s
Lint styles / run (classic)	1m 11s
Lint styles / run (fluent)	1m 10s
Render test pages / run	0s
Status check > Lint scripts	1s
Status check > A11y / prepare	1s
Create screenshots / run (default)	2m 24s
Create screenshots / run (bootstrap)	2m 45s
Create screenshots / run (material)	2m 21s
Create screenshots / run (classic)	2m 18s
Create screenshots / run (fluent)	2m 22s
Status check > A11y / run-checks (1)	3m 13s
Status check > A11y / run-checks (2)	2m 40s
Status check > A11y / run-checks (3)	2m 19s
Status check > A11y / run-checks (4)	2m 35s
Status check > Lint styles	1s
Detect changes	19s
Status check > Visual	1s
	30m 52s

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