fix: terminal session and private key issues

[CurtlyCritchlow]

- What I did
Fixed terminal session failing to close when ssh fails under certain conditions.
Fixed profile private key local storage not deleting when the complimentary private key is deleted.
Fixed profile name accepting uppercase letters
- How I did it

- How to verify it

1. Fun the flutter project
2. ssh with an invalid session user name, the created terminal should automatically close
3. delete a private key associated with a profile in the settings screen, expect the profile edit screen private key dropdown to have a null initial value ie no private key will be shown.
   - Description for the changelog

Fixed terminal session and private key issues