App: [$250] Implement offline behavior and error handling for `UpdateGroupChatAvatar`

We are now able to add a custom Group chat avatar. However, we do not handle the failure case yet.

Let’s take whatever we are doing for the Profile + Workspace pages and apply the same error handling here.

In the backend, we currently send exceptions like this:

Onyx::handleException($e, 'AD9240FD-A780-425D-B98D-96DD6E4251C1', OnyxKeys::COLLECTION_REPORT.$reportID, ['errorFields', 'avatar']);

Which will put an error field on the report if updating the avatar fails.

We need that error to lead the user back to the avatar and display an error message back to the user.

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• Upwork Job URL: https://www.upwork.com/jobs/~015da074a9479d6afc
• Upwork Job ID: 1778152731149742080
• Last Price Increase: 2024-04-17
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