Upload Page Timeout

[jperson1]

Upload Page Timeout (and Some JS Cleaning?)

Issue: #1050

Changes:

1. Implemented the 30s timeout for XLSX upload. If the frontend doesn't receive anything by then, it aborts the request and lets the user know.
2. Some minor cleanup of error reporting. All the info_box changes and console.error()'s are in one place, at least.
3. Moved the submit button below the info_box, so users are better able to see the feedback being presented.

How to test:

1. Switch to this branch and run normally.
2. Navigate to an XLSX upload page, like http://localhost:8000/audit/submission-progress/SACIDHERE.
3. You can try to find an upload that takes longer than 30 seconds, or you can navigate to /backend/static/js/globals.js and change it to a short value, such as 500 for 0.5 seconds.
4. Upload a .xlsx file, and see a relevant error message both on the page and in the browser console.

Screenshot:

[github-actions]

Terraform plan for management

No changes. Your infrastructure matches the configuration.

No changes. Your infrastructure matches the configuration.

Terraform has compared your real infrastructure against your configuration
and found no differences, so no changes are needed.

✅ Plan applied in Deploy to Development and Management Environment #66

[github-actions]

Terraform plan for dev

No changes. Your infrastructure matches the configuration.

No changes. Your infrastructure matches the configuration.

Terraform has compared your real infrastructure against your configuration
and found no differences, so no changes are needed.

✅ Plan applied in Deploy to Development and Management Environment #66

[jadudm]

@jperson1 , this looks good. There's a few changes that feel like they're not strictly about the timeout. I'm going to approve, and you do the merge if you feel good about what is in this PR.

(I'm seeing things like name changes on error handlers, etc., which I'm going to trust you to know to be OK, given that you're living in this space.)