fix: Save/load plugin data with layout

[mofojed]

• Plugin data was not getting saved with the workspace
• Reload the dashboard when a layout is imported by updating the key
• Fixes Exported layouts do not contain pluginDataMap #1861

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 46.15%. Comparing base (3ed4f6b) to head (3a22d39).
Report is 4 commits behind head on main.

❗ Current head 3a22d39 differs from pull request most recent head 1488ba7. Consider uploading reports for the commit 1488ba7 to get more accurate results

Files	Patch %	Lines
packages/code-studio/src/main/AppMainContainer.tsx	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1866      +/-   ##
==========================================
+ Coverage   46.11%   46.15%   +0.03%     
==========================================
  Files         636      636              
  Lines       38070    38071       +1     
  Branches     9627     9627              
==========================================
+ Hits        17556    17570      +14     
+ Misses      20461    20448      -13     
  Partials       53       53              

Flag	Coverage Δ
unit	46.15% <80.00%> (+0.03%)	⬆️

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[mattrunyon]

I guess this cast is because the actual data types are part of the dashboard package, but the redux package just marks them as unknown. We should probably clean that up at some point. Related #730