<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#44330, Resolves#44331
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] Added/updated automated tests. (I'd defer integration tests to a
separate PR since this one is pretty large already.)
- [x] QA'd all new/changed functionality manually. I've tested this on
both the setup flow and the organization settings page. I haven't had
the time to test this on other places where we render the logo (macOS
setup experience / MDM migration dialog).
https://github.com/user-attachments/assets/95d4eae5-3da6-40f4-98a1-8575b97d96b3
## New Fleet configuration settings
- [x] Setting(s) is/are explicitly excluded from GitOps.
Will handle GitOps in a separate PR.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Organizations can upload custom logos for light and dark modes.
* Registration and Org Settings support logo file upload, preview,
per-mode replace/delete, and validation (size & image formats).
* Activity feed records logo changes/deletions; site nav displays
uploaded logos per theme.
* File uploader/preview adds a Fleet logo graphic option and improved
logo validation.
* Config/GitOps outputs now include separate dark/light logo fields.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
* Remove username from UI code
* Remove username from tests
* Remove username from database
* Modify server endpoints for removing username
* Implement backend aspects of removing username
* Update API docs
* Add name to fleetctl
