#11971 Enhance WinForms Application static class to get current application context

[CuteLeon]

Fixes #11971

Proposed changes

• Add a new public static method on Application: GetCurrentApplicationContext()

Customer Impact

• A new public API

Regression?

• No

Risk

• No clearly risk

Test methodology

• Can get current application context from another thread
• Can get current application context from another thread with a message loop

Test environment(s)

• 9.0.100-preview.7.24407.12

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.24744%. Comparing base (a9a317d) to head (c3bbbf5).
Report is 75 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11972         +/-   ##
===================================================
+ Coverage   75.06611%   75.24744%   +0.18133%     
===================================================
  Files           3055        3079         +24     
  Lines         631875      633296       +1421     
  Branches       46776       46824         +48     
===================================================
+ Hits          474324      476539       +2215     
+ Misses        154177      153369        -808     
- Partials        3374        3388         +14     

Flag	Coverage Δ
Debug	75.24744% <97.67442%> (+0.18133%)	⬆️
integration	18.00908% <0.00000%> (+0.08181%)	⬆️
production	48.55688% <100.00000%> (+0.33924%)	⬆️
test	97.02099% <97.61905%> (+0.00418%)	⬆️
unit	45.53778% <100.00000%> (+0.27657%)	⬆️

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