Closes: 
- https://github.com/zed-industries/zed/discussions/56359

Self-Review Checklist:

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

Open to feedback or alternate approaches.
Could do `--ssh user@host:~code/proj` if preferred.
Or really cowboy it: regex replace `s|:~|/~|` and `s|:/|/|`; re-attempt
`Url::parse`

CC: @ConradIrwin

Release Notes:

- Add support for SCP style SSH urls: `zed ssh://user@host:~/code/proj`