[Cherry pick] fix(cdk/dialog): avoid setting aria-hidden before focus has moved #31036
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Cherry-picks #31030 into the patch branch.
The dialog moves focus in an
afterRender
, because it needs to give the content some time to be rendered. This is problematic with some relatively recent behavior in Chrome where thearia-hidden
gets blocked and a warning is logged if it contains the focused element.These changes add a way for the container to indicate when it's done moving focus and use the new API to apply the
aria-hidden
.Fixes #30187.