[Android][CoreCLR] Add full ReadyToRun publishing opt-in

[Copilot]

Note

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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Android CoreCLR Release publishing defaults to partial R2R to limit APK size. This adds a supported opt-in for full R2R when runtime performance is preferred.

• Publishing configuration

  • Adds MauiEnableFullReadyToRunPublishing, defaulting to false.
  • Preserves --partial by default; setting the property to true omits it.
  • Documents the APK-size versus runtime-performance tradeoff beside the target logic.

• Coverage

  • Adds MSBuild coverage for the default, explicit partial, and full R2R configurations.

<PropertyGroup>
  <MauiEnableFullReadyToRunPublishing>true</MauiEnableFullReadyToRunPublishing>
</PropertyGroup>

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[simonrozsival]

@copilot all MauiEnableFullReadyToRunPublishing_ConfiguresPartialFlagCorrectly tests are failing:

Assert.Equal() Failure: Values differ
Expected: 0
Actual:   1

   at Microsoft.Maui.Controls.MSBuild.UnitTests.MSBuildTests.Build(String projectFile, String target, String verbosity, String additionalArgs, Boolean shouldSucceed) in /_/src/Controls/tests/Xaml.UnitTests/MSBuild/MSBuildTests.cs:line 248
   at Microsoft.Maui.Controls.MSBuild.UnitTests.MSBuildTests.MauiEnableFullReadyToRunPublishing_ConfiguresPartialFlagCorrectly(String mauiEnableFullReadyToRunPublishingValue, Boolean fullReadyToRunPublishingEnabled) in /_/src/Controls/tests/Xaml.UnitTests/MSBuild/MSBuildTests.cs:line 306
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)

[Copilot]

@copilot all MauiEnableFullReadyToRunPublishing_ConfiguresPartialFlagCorrectly tests are failing:

Assert.Equal() Failure: Values differ

...

Fixed in cff19a6. The test now configures the simulated Android publish properties in its generated project rather than as global MSBuild properties, avoiding an Android workload requirement in the test environment. Focused coverage passes all three cases.