### Description:

Previously, formatting was only applied after manually saving the file,
once it had already been created and saved. After the fix, when creating
a new file from the editor and saving it for the first time with a
filename, formatting is automatically applied if “format on save” is
enabled.

### Self-Review Checklist:

- [X] I've reviewed my own diff for quality, security, and reliability
- [X] Unsafe blocks (if any) have justifying comments
- [X] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [X] Tests cover the new/changed behavior
- [X] Performance impact has been considered and is acceptable

Closes #22534

Release Notes:

- Fixed apply formatting when a new file is first created