Customizer: Scheduling: Delay button shake

[melchoyce]

The "Schedule" button currently shakes immediately after selecting "Schedule" in Publish Settings, but there should be a delay. Right now it's drawing attention away from actually setting a time to schedule your changes to go live. I don't think we should shake the button until after the Publish Settings panel has been closed, maybe with a second's delay.

[bpayton]

I have a patch for this based on work for #42114 (which includes a reusable function for bouncing things after a delay if they aren't focused first). I'm managing the work under a single PR for discussion since there is shared, unreviewed code.
​https://github.com/xwp/wordpress-develop/pull/284

I'll continue discussion under #42114 and provide a separate patch here if necessary.

[westonruter]

@bpayton with #42114 merged, this is ready to round out.

[bpayton]

@westonruter, I created a PR since we've worked well with them. It is ready for review here:
​https://github.com/xwp/wordpress-develop/pull/291

[westonruter]

In 41932:

Customize: Draw attention to save button after collapsing the publish settings section when the changeset status or date had been changed.

Props bpayton, westonruter.
See #42114, #39896.
Fixes #42211.

[westonruter]

In 41947:

Customize: Prevent drawing attention to save button if status unchanged from publish; account for changes to status/date when alerting about unsaved changes.

Also fix malformed ESLint directive from [41933].

Amends [41932].
See #39896, #42211.