Fixes AvatarStack styling bugs (focus on stacking context issues) #20654

Job	Run time
aat-reports / aat-runner-all-flags (1)	8m 36s
aat-reports / aat-runner-all-flags (3)	9m 5s
aat-reports / aat-runner-all-flags (2)	8m 12s
vrt-reports / vrt-runner-all-flags (3)	5m 20s
aat-reports / aat-runner (3)	8m 27s
aat-reports / aat-runner (1)	8m 28s
aat-reports / aat-runner (2)	8m 22s
vrt-reports / vrt-runner (4)	5m 10s
vrt-reports / vrt-runner (2)	5m 15s
vrt-reports / vrt-runner-all-flags (2)	5m 3s
aat-reports / aat-runner-all-flags (4)	8m 24s
aat-reports / aat-runner (4)	8m 4s
vrt-reports / vrt-runner (3)	5m 25s
vrt-reports / vrt-runner (1)	6m 18s
vrt-reports / vrt-runner-all-flags (1)	6m 7s
vrt-reports / vrt-runner-all-flags (4)	4m 57s
vrt-reports / vrt-all-flags	51s
vrt-reports / vrt	1m 2s
aat-reports / aat	59s
aat-reports / aat-all-flags	51s
build	1m 49s
deploy-preview	11s
Preview Storybook	4s
	1h 57m 0s

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