Add quick select ssh endpoint options

[digcheese]

Description

• Resolves Upgrade Polaris-GUI testability #26
• added methods to restart the GUI without needing to use the terminal
• added a dropdown to choose a different ssh credentials 'profile' which then restarts the gui and all the ssh endpoints.
  • The profiles are: Wifi/new, Wifi/old, remote/new, and remote/old
• refactored how ssh credentials are obtained for the workers, either passed in as an argument (for multiprocessing workers that are initialized when the GUI is opened) or via get_SSH_credentials() (for QThreads)
• added an optional command line flag/argument (-p or --profile) to select a specific SSH cred profile.
• added a template SSH credentials profile .yaml file that must be renamed into credentials.yml

Verification

• Tested over remote tailscale connections.
  • The RPI temperature readings work!!
• eliminated all warnings and crashes related to the new features.
• A full system test with the sensors would be preferred

[FireBoyAJ24]

Where do we store the credentials.yml or do we make it and provide it to users when they access the Polaris-GUI documentation?

[digcheese]

credentials.yml is stored in src/ with the example-credentials.yml file. I think the best way is for there to be some sort of copy/paste on a confluence page where ppl can transfer the real credentials to the file.