Remove UseLatestAndroidPlatformSdk

[Copilot]

Removes the legacy UseLatestAndroidPlatformSdk concept from Xamarin.Android. This property was a Xamarin.Android-era feature with no use in the .NET Android SDK — treating it as always false and inlining accordingly.

ResolveAndroidTooling.cs (Legacy task)

• Removed UseLatestAndroidPlatformSdk property
• Removed the "use latest installed SDK" branch from ValidateApiLevels() along with its priority-order comment
• Removed GetMaxInstalledApiLevel() helper (only used by the removed branch)
• ValidateApiLevels() now only resolves via $(TargetFrameworkVersion) or $(AndroidApiLevel); logs XA0000 if neither is set

ResolveSdksTaskTests.cs

• Removed TargetFrameworkPairing test and data (relied entirely on UseLatestAndroidPlatformSdk = true)
• Removed the 6 parameterized cases that set UseLatestAndroidPlatformSdk = true and the implicit-fallback case where neither TFV nor API level was provided
• Renamed remaining test data/method: UseLatestAndroidSdkTestCases → ResolveAndroidToolingTestCases, UseLatestAndroidSdk → ResolveAndroidToolingTest
• Removed UseLatestAndroidPlatformSdk = false from ResolveSdkTiming

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[Copilot]

Pull request overview

This PR removes the legacy UseLatestAndroidPlatformSdk property from Xamarin.Android, which was a Xamarin.Android-era feature that has no use in the modern .NET Android SDK. The change treats this property as if it were always false and simplifies the code accordingly.

Changes:

• Removed UseLatestAndroidPlatformSdk property and its associated logic from ResolveAndroidTooling.cs
• Simplified ValidateApiLevels() to only resolve via $(TargetFrameworkVersion) or $(AndroidApiLevel), logging XA0000 error if neither is set
• Removed 7 test cases from ResolveSdksTaskTests.cs that relied on UseLatestAndroidPlatformSdk behavior and renamed test artifacts

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Xamarin.Android.Build.Tasks/Tasks/Legacy/ResolveAndroidTooling.cs	Removed UseLatestAndroidPlatformSdk property, GetMaxInstalledApiLevel() helper method, and simplified ValidateApiLevels() to only use TargetFrameworkVersion or AndroidApiLevel
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/ResolveSdksTaskTests.cs	Removed TargetFrameworkPairing test and 6 parameterized test cases that used UseLatestAndroidPlatformSdk=true, renamed test data and method from UseLatestAndroidSdk* to ResolveAndroidTooling*

[jonathanpeppers]

Only test failure is: Build_CSharp_Change

MAUI Integration Tests have an unrelated failure.

The updated tests look OK: