ORA File Uploads UX - Show in-context file upload errors

From discovery work done in https://openedx.atlassian.net/browse/EDUCATOR-5531 and catalogued in this doc, when a file fails to upload, temporarily show it with a warning in the file upload list.

Why? When files fail to upload, we show a banner with a generic upload error message and hide the failed file from the list. This banner can get clobbered if the error is buried among successful uploads and it might not be obvious to a learner that their file failed (especially with multi-file uploads).

We want to make it very obvious, while still on the page, what files failed to help the learner re-upload. We also want to make the warning temporary, so they don't need to do extra work, like manually clearing an error or deleting a bad metadata entry, while not making them take any more actions than necessary to get the submission into a ready state.

AC:

• On upload failure, show the file that failed with warning info (e.g. file 1 (test.png) ⚠ File upload failed) in the upload list.

• This warning should be temporary, uploading more files or a page reload should wipe the warning.

TO-DO

• Work with on mocks

• Work with on wording