fix(menu): restore focus immediately when menu is closed

[crisbeto]

Currently in some cases we restore focus immediately and in others we wait for the exit animation to finish (when using matMenuContent) because the focus restoration logic is coupled to the menu cleanup. This means that if multiple animations overlap, we could end up restoring focus to the wrong element. These changes switch to restoring focus immediately in all cases.

Fixes #16954.

[Harpush]

@crisbeto is it related to #16502 (comment) by any chance?

[crisbeto]

@Harpush this is purely for when focus is restored when a menu is closed, it doesn't have anything to do with #16502.

[jelbourn]

LGTM

[ngbot]

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