Add spinners and disable forms while data is being loaded - alternate

[alexcottner]

Alternate (hopefully slightly cleaner) PR compared to 3049.

The goal of this PR is to prevent users from interacting with forms while we're waiting on server responses. I think the easiest way to do that is to:

1. Disable the forms while we're waiting for responses after user submissions/onChange events that trigger API calls
2. Provide a visual cue to users that data is being loaded

This should resolve the following open issues:

1. Display a busy state whenever the server info is fetched
2. Prevent double submission of forms
3. Simple review should disable the approve/reject buttons after they're clicked
4. Loading indicator not shown when loading history

simplescreenrecorder-2023-11-01_11.41.55.mp4

[grahamalama]

Nice! I'll throw an approval here for now, though you said you're still going to add some tests to cover, #1360, #2206, and #1596 right?

[grahamalama]

Do we need these?

[alexcottner]

Nope! Added them out of habit and forgot to remove them because prettier made them too small. I noticed them in the next branch and will be removing them then.