fixes #2811 Updated nullable values for OAPH

[ChrisPulman]

fixes #2811 can pass nullable in but return type is not forced to nullable

What kind of change does this PR introduce?

fix

What is the current behaviour?

OAPH returns a nullable type regardless of the OAPH it is attached to

What is the new behaviour?

OAPH returns a matching type of the OAPH it is attached to

What might this PR break?

none

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 #2813 (d6af992) into main (32d2838) will increase coverage by 0.57%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             main    #2813      +/-   ##
==========================================
+ Coverage   64.47%   65.04%   +0.57%     
==========================================
  Files         134      134              
  Lines        4712     4712              
==========================================
+ Hits         3038     3065      +27     
+ Misses       1674     1647      -27     

Impacted Files	Coverage Δ
...eUI.Fody.Helpers/ObservableAsPropertyExtensions.cs	41.93% <ø> (ø)
...ObservableForProperty/INPCObservableForProperty.cs	86.48% <60.00%> (ø)
...iveUI/Mixins/ReactiveNotifyPropertyChangedMixin.cs	83.33% <100.00%> (ø)
...I/ObservableForProperty/OAPHCreationHelperMixin.cs	38.40% <100.00%> (ø)
...bservableForProperty/ObservableAsPropertyHelper.cs	94.11% <100.00%> (ø)
src/ReactiveUI/VariadicTemplates.cs	52.36% <0.00%> (+6.73%)	⬆️

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[github-actions]

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