Apply fixes and refinements

[Al12rs]

• fixes Use unique key to identify a GameInstallation in the DataStore #986
• fixes Ingest outside changes into last applied loadout instead of current one #987
• fixes DiskState is stored with loadout revision id that is not guaranteed to match the state #984
• fixes Outside changes are discarded on ingest (new loadout isn't used) #983
• Handles parts of Apply/Ingest - Apply loadout experience Refinement #995

Recap:

• Apply button now correctly shows up when current loadout revision != last applied revision
• Apply button now shows Activate text when you need to switch loadouts
• Apply button now ingests outside changes and merges uncommitted changes on top
• Launch button no longer applies, but still merges at the end of the run
• Last applied revision is now correctly saved and restored
• Bunch of Apply button styling fixes and improvements

Warning!

This requires nuking the Datamodel. App will crash and burn otherwise as its missing lastAppliedRevision

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 31.40496% with 166 lines in your changes are missing coverage. Please review.

Project coverage is 56.99%. Comparing base (9f8e770) to head (d9d8214).
Report is 21 commits behind head on main.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1015      +/-   ##
==========================================
- Coverage   58.19%   56.99%   -1.21%     
==========================================
  Files         644      644              
  Lines       21069    21200     +131     
  Branches     1650     1653       +3     
==========================================
- Hits        12261    12082     -179     
- Misses       8411     8721     +310     
  Partials      397      397              

Flag	Coverage Δ
Linux	56.20% <31.40%> (-1.29%)	⬇️
Windows	56.14% <31.40%> (-1.26%)	⬇️
clean_environment_tests	56.97% <31.40%> (-1.21%)	⬇️
macOS	55.65% <31.40%> (-1.24%)	⬇️
network_tests	?
networking_tests	?

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

Files	Coverage Δ
...s/NexusMods.Abstractions.Serialization/Services.cs	100.00% <100.00%> (ø)
src/NexusMods.DataModel/ToolManager.cs	90.00% <100.00%> (+20.00%)	⬆️
....StandardGameLocators.TestHelpers/ListFilesTool.cs	100.00% <100.00%> (ø)
...p.UI/LeftMenu/Items/ApplyControlDesignViewModel.cs	0.00% <0.00%> (ø)
.../NexusMods.DataModel/Loadouts/DiskStateRegistry.cs	93.18% <90.47%> (-3.25%)	⬇️
tests/NexusMods.DataModel.Tests/ToolTests.cs	0.00% <0.00%> (ø)
.../NexusMods.Abstractions.DiskState/DiskStateTree.cs	76.31% <55.55%> (-8.00%)	⬇️
...rc/NexusMods.App.UI/Resources/Language.Designer.cs	57.63% <0.00%> (-2.51%)	⬇️
src/NexusMods.DataModel/ApplyService.cs	66.23% <62.71%> (+66.23%)	⬆️
...ods.App.UI/LeftMenu/Items/ApplyControlViewModel.cs	0.00% <0.00%> (ø)
... and 1 more

... and 24 files with indirect coverage changes