Fix Attribute On Partial Reactive Property Is Duplicated

[ChrisPulman]

What kind of change does this PR introduce?

Fixes #245

What is the current behavior?

#245

What is the new behavior?

This pull request introduces several changes to improve attribute handling, correct a typo in method names, and enhance the property syntax generation in the ReactiveUI.SourceGenerators project. The most important changes include refining the logic for forwarding attributes, fixing a recurring typo in the IsISchedulerType method, and updating the property syntax generation to include attribute handling.

Attribute handling improvements:

• src/ReactiveUI.SourceGenerators.Execute/TestViewModel.cs: Added [JsonPropertyName("test")] to the PartialPropertyTest property to specify the JSON serialization name.
• src/ReactiveUI.SourceGenerators.Roslyn/Core/Extensions/ContextExtensions.cs: Updated the GetForwardedAttributes method to check for the [Reactive] attribute and prevent forwarding attributes without field targets when the property is reactive. [1] [2]

Typo correction:

• src/ReactiveUI.SourceGenerators.Roslyn/Core/Extensions/ITypeSymbolExtensions.cs: Fixed a typo in the method name IsIShedulerType, correcting it to IsISchedulerType.
• src/ReactiveUI.SourceGenerators.Roslyn/ReactiveCommand/ReactiveCommandGenerator.Execute.cs: Corrected the same typo in multiple locations where IsIShedulerType was used in conditional checks. [1] [2] [3]

What might this PR break?

None due to build failure in previous versions

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:

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