fix(material/dialog): dialog name on mac only using aria-label

[essjay05]

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Fixes bug with Angular Components Dialog component on Mac whether using Chrome or Firefox the screenreader does not read the dialog name/title unless it is using an aria-label. Updates the dialog-content-directives to read/apply the aria- labelledby and aria-describedby values if they exist.

Fixes b/274674581

[github-actions[bot]]

Deployed dev-app for 119d68b114abbf1698a5901468c27e31caef9831 to: https://ng-dev-previews-comp--pr-angular-components-29264-dev-rjpcttjr.web.app

Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt.

[essjay05]

Reverting this PR and closing as it looks like the aria-labelledby bug is specific to MacOS+Firefox even on a plain HTML/CSS/Vanilla Javascript Dialog and is not due to Angular Components.

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