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]

I see that you just added the pr: merge ready label, but the following checks are still failing:
status "ci/circleci: tests_browserstack" is failing

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}