[ModalUnstyled] Apply aria-hidden to the correct Elements in the tree when disablePortal or container props are used

[Greg-NetDuma]

Fixes https://github.com/mui/material-ui/issues/19450

Changes:

• Make sure we pass in the correct container if disablePortal is used.
• If the modal container is deep in the tree we need to make sure every sibling in every ancestor level is aria-hidden and and every aria-hidden we added gets cleaned up properly on unmount.
• In addition because we don't differentiate between aria-hidden tags that got added by modals and added by devs, we need to pierce through (remove) every aria-hidden attribute in every ancestor of the modal container; this is to prevent no accessible elements on a page when multiple modals are present.

PS.: Existing tests were wrong, fixed them.

• [X] I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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@material-ui/core: parsed: +0.08% , gzip: +0.13% @material-ui/unstyled: parsed: +0.33% , gzip: +0.43% @mui/joy: parsed: +0.06% , gzip: +0.10%

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[Greg-NetDuma]

This clearly needs some new test cases, for example:

~1. Modal added that doesn't use portal on after a Modal that uses the portal - toplevel is not aria-hidden~ ~2. Modal added that doesn't use portal on after a Modal that doesn't use the portal - toplevel is still not aria-hidden~ ~3. Modal added that uses portal on after a Modal that doesn't use the portal~ ~4. Modal added that uses portal on after a Modal that uses the portal - previous behaviour~

~Technically I can get away just adding the 1. and 3. because the previous modal doesn't affect adding a new one on top of it.~

~Last Modal removed doesn't really need a test because it's a different codepath, aria-hidden is always removed.~

I ended up fixing the existing tests because they were wrong.

[ZeeshanTamboli]

Since there is no activity, I am closing this PR.