Convert ready operations to promises.

Review Request #2376 — Created Dec. 11, 2021 and submitted

guest5512
Review Board
guest
This change updates the `ready` method to use promises and async/await
instead of callbacks. This flattens almost all of our remaining
asynchronous operations.

Testing Done:
- Ran js-tests.
- Smoke tested various UI functionality.

Reviewed at https://reviews.reviewboard.org/r/11842/

done testing, no probelm

guest5512
guest5512
guest5512
guest5512
Review request changed

Status: Closed (submitted)

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