Update GetDefaultOpenPageBehavior

[erri120]

Part of #946. This PR implements the flowchart we developed earlier and most of #946.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.26994% with 143 lines in your changes are missing coverage. Please review.

Project coverage is 55.16%. Comparing base (021e5a1) to head (07acaa9).
Report is 6 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1052      +/-   ##
==========================================
+ Coverage   54.78%   55.16%   +0.37%     
==========================================
  Files         659      662       +3     
  Lines       21886    21992     +106     
  Branches     1709     1717       +8     
==========================================
+ Hits        11990    12131     +141     
+ Misses       9492     9460      -32     
+ Partials      404      401       -3     

Flag	Coverage Δ
Linux	54.45% <12.26%> (-0.34%)	⬇️
Windows	54.38% <12.26%> (?)
clean_environment_tests	55.14% <12.26%> (+0.36%)	⬆️
macOS	53.94% <12.26%> (?)

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

Files	Coverage Δ
...usMods.App.UI/WorkspaceSystem/Page/IPageFactory.cs	86.36% <100.00%> (+1.36%)	⬆️
...p.UI/WorkspaceSystem/Page/PageFactoryController.cs	52.38% <100.00%> (+5.01%)	⬆️
...paceSystem/WorkspaceController/AddPanelBehavior.cs	66.66% <ø> (ø)
...Mods.App.UI/WorkspaceSystem/Page/APageViewModel.cs	93.33% <0.00%> (-6.67%)	⬇️
...UI/WorkspaceSystem/Workspace/WorkspaceViewModel.cs	48.43% <0.00%> (+0.74%)	⬆️
...paceSystem/WorkspaceController/OpenPageBehavior.cs	0.00% <0.00%> (ø)
...Mods.App.UI/LeftMenu/Home/HomeLeftMenuViewModel.cs	66.66% <50.00%> (+4.16%)	⬆️
...c/NexusMods.App.UI/WorkspaceSystem/PageIdBundle.cs	0.00% <0.00%> (ø)
...I/LeftMenu/Downloads/DownloadsLeftMenuViewModel.cs	0.00% <0.00%> (ø)
...pp.UI/LeftMenu/Loadout/LoadoutLeftMenuViewModel.cs	0.00% <0.00%> (ø)
... and 3 more

... and 35 files with indirect coverage changes

[github-actions]

This PR conflicts with main. You need to rebase the PR before it can be merged.

[github-actions]

This PR doesn't conflict with main anymore. It can be merged after all status checks have passed and it has been reviewed.

[Al12rs]

Closing and reopening to update target of the diff

[Al12rs]

I'm sorry I'm slipping, I meant to test this locally with the View Mod contents.
I just checked the code and LoadoutGridViewModel is using a custom behavior instead of GetDefaultBehavior.
Could you do another PR to fix that? Or I can add it to the list if you are busy