Closes#6783
With this PR, the `journal: new journal entry` command only opens a new
workspace if the current workspace does not already contain the
`journal` directory. Both the root of the work tree and all its
subdirectories are checked.
This does not yet check for the day's file specifically, as suggested
[here](https://github.com/zed-industries/zed/issues/6783#issuecomment-2268509463).
I'm new to writing Rust code in production (as well as contributing in
general), so any feedback is much appreciated!
Release Notes:
- Reuse workspace on `journal: new journal entry` command if possible
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