Workspace cleanup

[erri120]

Conforms the workspace code to the new guidelines, improving readability, simplicity, and performance.

Related to #674.

[codecov]

Codecov Report

Merging #754 (f5f0a65) into main (9182f89) will increase coverage by 0.41%.
Report is 1 commits behind head on main.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #754      +/-   ##
==========================================
+ Coverage   62.70%   63.12%   +0.41%     
==========================================
  Files         585      605      +20     
  Lines       17420    18344     +924     
  Branches     1219     1298      +79     
==========================================
+ Hits        10924    11580     +656     
- Misses       6177     6422     +245     
- Partials      319      342      +23     

Flag	Coverage Δ
Linux	62.50% <0.00%> (+0.53%)	⬆️
Windows	62.32% <0.00%> (+0.47%)	⬆️
clean_environment_tests	63.11% <0.00%> (+0.42%)	⬆️

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

Files	Coverage Δ
...Mods.App.UI/WorkspaceSystem/DataStore/PanelData.cs	0.00% <0.00%> (ø)
...ceSystem/AddPanelButton/AddPanelButtonViewModel.cs	0.00% <0.00%> (ø)
...em/PanelTabHeader/PanelTabHeaderDesignViewModel.cs	0.00% <0.00%> (ø)
...p.UI/WorkspaceSystem/PanelTab/PanelTabViewModel.cs	0.00% <0.00%> (ø)
...ceSystem/PanelTabHeader/PanelTabHeaderViewModel.cs	0.00% <0.00%> (ø)
src/NexusMods.App.UI/Extensions/ListAdapter.cs	0.00% <0.00%> (ø)
...em/AddPanelButton/AddPanelButtonDesignViewModel.cs	0.00% <0.00%> (ø)
src/NexusMods.Common/EnumerableExtensions.cs	64.28% <0.00%> (-12.86%)	⬇️
...UI/WorkspaceSystem/Workspace/WorkspaceViewModel.cs	0.00% <0.00%> (ø)
...ods.App.UI/WorkspaceSystem/Panel/PanelViewModel.cs	0.00% <0.00%> (ø)

... and 58 files with indirect coverage changes