[gui] remember terminal font size

[levkropp]

This pull request introduces a new feature to persist the terminal font size setting across terminal tabs using the a session-level provider. The changes include modifying the font size logic in the terminal state, and updating the font size adjustment actions to save changes to the provider.

[sharder996]

Not going to block on it, but it would be nice if the behaviour mirrored bash or zsh and it's terminal zoom didn't persist across application shutdown. i.e. reset back to default after quitting and restarting the Multipass GUI.

[levkropp]

I've created a new notifier and provider for terminal font size that resets when the GUI is closed. The previous implementation was using the guiSettingsProvider which saves its settings across sessions which was the reason for this behavior.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.37%. Comparing base (f067fad) to head (f7f23c0).
⚠️ Report is 570 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4208   +/-   ##
=======================================
  Coverage   89.37%   89.37%           
=======================================
  Files         259      259           
  Lines       15744    15744           
=======================================
  Hits        14071    14071           
  Misses       1673     1673           

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[sharder996]

Looks good. Thanks, @levkropp

[Sploder12]

LGTM!

[sharder996]

@levkropp needs another rebase to fix a linting issue that has since been merged in.