Fix for MAUI WinUI Schedulers

[ChrisPulman]

What kind of change does this PR introduce?

Fix for #3020

What is the current behaviour?

Maui WinUI does not have Schedulers set for RxApp Schedulers

What is the new behaviour?

Maui WinUI has a Scheduler set for RxApp.MainThreadScheduler and RxApp.TaskpoolScheduler
other WinUI registrations applied.

What might this PR break?

Please check if the PR fulfils these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #3306 (d8e8059) into main (a03e713) will increase coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3306      +/-   ##
==========================================
+ Coverage   63.83%   64.05%   +0.22%     
==========================================
  Files         157      157              
  Lines        5726     5726              
==========================================
+ Hits         3655     3668      +13     
+ Misses       2071     2058      -13     

Impacted Files	Coverage Δ
...activeUI.Uwp/Common/AutoDataTemplateBindingHook.cs	95.00% <ø> (ø)
...eUI.Uwp/Common/BooleanToVisibilityTypeConverter.cs	70.58% <ø> (ø)
src/ReactiveUI.Uwp/Common/ReactivePage.cs	0.00% <ø> (ø)
src/ReactiveUI/RxApp.cs	81.94% <0.00%> (+6.94%)	⬆️
.../Converter/NullableIntegerToStringTypeConverter.cs	94.44% <0.00%> (+11.11%)	⬆️
src/ReactiveUI.Wpf/Registrations.cs	94.11% <0.00%> (+11.76%)	⬆️
src/ReactiveUI.Winforms/Registrations.cs	94.11% <0.00%> (+11.76%)	⬆️
.../ReactiveUI/Platforms/net/PlatformRegistrations.cs	85.71% <0.00%> (+28.57%)	⬆️

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.