feat(ui): persist file upload status

[andrewrisse]

Description

Two parts:

1. Notify user of successful file upload even when leaving file-management page
2. Display special toast when vectorizing files for an assistant with those files' progress

Notes

If we need to show regular file upload (file-management page) error toasts, then the backend needs to implement: 
https://platform.openai.com/docs/api-reference/uploads
We do not currently have background processing enabled for file uploads, so the best we can do for realtime notifications is show a success toast when the new file is inserted into the file_objects table. On error, there is no realtime notification available.

Deployed on LF-04

Fixes #671

https://www.loom.com/share/e2da2a3f674a45bc8d94bce5f3ef4d4d?sid=75d0c91d-dedf-4a31-8b7f-b59efd5ebd48

Checklist before merging

• Tests, documentation, ADR added or updated as needed
• Followed the Contributor Guide Steps

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[gregclark-defenseunicorns]

@andrewrisse, File Management notifications are working great! The Save button on the Edit/New Assistant page is disabled and I am unable to click it. This is on lf-04

[andrewrisse]

@andrewrisse, File Management notifications are working great! The Save button on the Edit/New Assistant page is disabled and I am unable to click it. This is on lf-04

Unable to replicate, can you explain how you got into this scenario

[andrewrisse]

@andrewrisse, File Management notifications are working great! The Save button on the Edit/New Assistant page is disabled and I am unable to click it. This is on lf-04

Unable to replicate, can you explain how you got into this scenario

I believe you were testing this on lf-04 when it did not have this branch deployed. I had to deploy a different story to lf-04 for a while yesterday morning.

stale review