## Description
Fixes `Avatar::AvatarFromUrlJob` logging 404 errors as ERROR when
avatars don't exist
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
## Checklist:
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Small logging-only behavior change that doesn’t affect attachment flow
or persisted data beyond existing sync-attribute updates.
>
> **Overview**
> Updates `Avatar::AvatarFromUrlJob` error handling to treat
`Down::NotFound` (404/missing avatar URL) as a non-error: it now logs an
INFO message instead of logging as ERROR.
>
> Other `Down::Error` failures continue to be logged as ERROR, and the
job still runs `update_avatar_sync_attributes` in `ensure`.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
675f41041ae3dd4ead6e0dee5f1586dcad9750cd. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
Invalid urls supplied to the job was causing sentry issues. The issue primarily occurs when the download file.original_filename comes out as empty
fixes: https://github.com/chatwoot/chatwoot/issues/10449
fixes: #3853
- Introduced DISABLE_GRAVATAR Global Config, which will stop chatwoot from making API requests to gravatar
- Cleaned up avatar-related logic and centralized it into the avatarable concern
- Added specs for the missing cases
- Added migration for existing installations to move the avatar to attachment, rather than making the API that results in 404.
