Replace Locator with AppLocator and RxApp with RxSchedulers

[ChrisPulman]

What kind of change does this PR introduce?

update

What is the new behavior?

Updated references from Locator to AppLocator and RxApp to RxSchedulers across README, test files, and source generator code for consistency with new APIs. Removed commented PolySharp polyfill configuration from the project file.

What might this PR break?

AppLocator replaced Locator where used

Please check if the PR fulfills 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.04%. Comparing base (cbb80f6) to head (158a016).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #339   +/-   ##
=======================================
  Coverage   40.04%   40.04%           
=======================================
  Files          61       61           
  Lines        3389     3389           
  Branches      389      389           
=======================================
  Hits         1357     1357           
  Misses       1926     1926           
  Partials      106      106           

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[Copilot]

Pull request overview

This PR updates ReactiveUI API references to align with the latest naming conventions, replacing deprecated Locator with AppLocator and RxApp with RxSchedulers throughout the codebase. This ensures consistency with the modern ReactiveUI API and improves maintainability.

Key Changes:

• Updated scheduler references in ReactiveCommand source generator from RxApp to RxSchedulers
• Replaced Locator with AppLocator in test files and documentation examples
• Removed commented-out PolySharp configuration from project file

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/ReactiveUI.SourceGenerators/ReactiveUI.SourceGenerators.csproj	Cleaned up commented-out PolySharp polyfill configuration and whitespace
src/ReactiveUI.SourceGenerators.Roslyn/ReactiveCommand/ReactiveCommandGenerator.Execute.cs	Updated scheduler constants from RxApp.MainThreadScheduler/TaskpoolScheduler to RxSchedulers.MainThreadScheduler/TaskpoolScheduler
src/ReactiveUI.SourceGenerators.Execute/TestViewWpf.cs	Updated dependency injection reference from Locator.CurrentMutable to AppLocator.CurrentMutable
src/ReactiveUI.SourceGenerators.Execute/TestViewModel.cs	Updated scheduler reference from RxApp.MainThreadScheduler to RxSchedulers.MainThreadScheduler
README.md	Updated documentation examples to use AppLocator.Current and AppLocator.CurrentMutable instead of deprecated Locator API

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[github-actions]

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