fix #2866 CanExecute Scheduler

[ChrisPulman]

Changed ObserveOn to only affect the internal subscription

What kind of change does this PR introduce?

fix #2866

What is the current behaviour?

CanExecute stops Execute functioning when ObserveOn is assigned to global function

What is the new behaviour?

CanExecute only has ObserveOn assigned to internal subscription

What might this PR break?

none expected all existing tests are passing

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 #2880 (d34db1c) into main (42e2e90) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2880      +/-   ##
==========================================
- Coverage   71.97%   71.95%   -0.02%     
==========================================
  Files         144      144              
  Lines        5006     5007       +1     
==========================================
  Hits         3603     3603              
- Misses       1403     1404       +1     

Impacted Files	Coverage Δ
src/ReactiveUI/ReactiveCommand/ReactiveCommand.cs	82.94% <100.00%> (+0.07%)	⬆️
...ctiveUI/Platforms/windows-common/RoutedViewHost.cs	86.44% <0.00%> (-1.70%)	⬇️

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[github-actions]

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