fix: Prompt for resetting layout

[bmingles]

User is not prompted to confirm when using the "reset layout" feature.

• With unsaved notebook changes, prompt title will be "Reset layout and discard unsaved changes"
• With open notebooks that are saved or no open notebooks, prompt title will be "Reset Layout"
• If user clicks "Reset", layout will be reset. Unsaved notebook changes will be lost
• If user clicks "Cancel", layout will not be reset and notebooks remain open

fixes #1250

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (49723ec) 46.41% compared to head (ece22b4) 46.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1552      +/-   ##
==========================================
- Coverage   46.41%   46.37%   -0.04%     
==========================================
  Files         564      564              
  Lines       35765    35757       -8     
  Branches     8946     8952       +6     
==========================================
- Hits        16599    16583      -16     
- Misses      19116    19122       +6     
- Partials       50       52       +2     

Flag	Coverage Δ
unit	46.37% <41.17%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ashboard-core-plugins/src/panels/NotebookPanel.tsx	2.33% <100.00%> (+0.76%)	⬆️
packages/code-studio/src/main/AppMainContainer.tsx	31.15% <23.07%> (-5.98%)	⬇️

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[mattrunyon]

Code looks good. Want @dsmmcken to confirm the wording is what he wants

[bmingles]

Code looks good. Want @dsmmcken to confirm the wording is what he wants

Don actually gave me the text.