Update App UI Layout, add Workspaces and Tab names

[Al12rs]

closes #706

• Update MainWindow App ToolBar layout
• Add Workspace Title to App ToolBar
• Remove search from ToolBar
• Add disabled ToolBar buttons for future use
• Fixed ToolBar Action button disabled style
• Set Page names on their Tab Header
• Remove Loadout Name from page toolbar since it's on the tab

[codecov-commenter]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (d6e79c9) 58.54% compared to head (e927e19) 58.71%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #950      +/-   ##
==========================================
+ Coverage   58.54%   58.71%   +0.16%     
==========================================
  Files         626      630       +4     
  Lines       20177    20260      +83     
  Branches     1551     1557       +6     
==========================================
+ Hits        11812    11895      +83     
+ Misses       8007     8005       -2     
- Partials      358      360       +2     

Flag	Coverage Δ
Linux	58.01% <70.83%> (+0.13%)	⬆️
Windows	57.96% <70.83%> (+0.15%)	⬆️
clean_environment_tests	58.69% <70.83%> (+0.16%)	⬆️
networking_tests	?

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

Files	Coverage Δ
.../NexusMods.App.UI/Controls/Spine/SpineViewModel.cs	68.07% <100.00%> (+0.19%)	⬆️
...NexusMods.App.UI/Pages/MyGames/MyGamesViewModel.cs	100.00% <100.00%> (ø)
src/NexusMods.App.UI/Services.cs	98.48% <100.00%> (+0.03%)	⬆️
...nts/AttachmentsFactories/HomeAttachmentsFactory.cs	100.00% <100.00%> (ø)
...tachmentsFactories/IWorkspaceAttachmentsFactory.cs	100.00% <100.00%> (ø)
...WorkspaceSystem/Controllers/WorkspaceController.cs	48.25% <100.00%> (+11.19%)	⬆️
...UI/WorkspaceSystem/Workspace/WorkspaceViewModel.cs	48.81% <100.00%> (+0.13%)	⬆️
...eAttachments/WorkspaceAttachmentsFactoryManager.cs	92.30% <88.88%> (-7.70%)	⬇️
...exusMods.App.UI/Controls/TopBar/TopBarViewModel.cs	72.83% <87.50%> (+4.50%)	⬆️
...ttachmentsFactories/DownloadsAttachmentsFactory.cs	0.00% <0.00%> (ø)
... and 4 more

... and 5 files with indirect coverage changes

[erri120]

See comments.