fix(material/dialog): dialog actions overflow and are unreachable

[essjay05]

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Fixes a bug in the Angular Material dialog component where buttons/actions are unreachable due to dialog overflowing because of unspecified max-height for the mat-dialog-container parent flexbox.

Fixes #24785

[essjay05]

Before fix screenshot (portrait):

Before fix screenshot (landscape):

After fix screenshot (portrait):

After fix screenshot (landscape):

[mmalerba]

FYI, this needs a sync

[essjay05]

Need to make confirm that bug still exists after latest dialog changes were pushed.

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