[Tests] Skip AfterILLinkAdditionalStepsIsSkippedOnSecondBuild on NativeAOT

This test verifies the _RunAfterILLinkAdditionalSteps target and its afterlink/
output. That target is intentionally skipped on the trimmable typemap path
(Condition "... '$(_AndroidTypeMapImplementation)' != 'trimmable'"), because the
trimmable path generates the typemap at compile time in _GenerateTrimmableTypeMap.

The test is unchanged from main and passed only because NativeAOT used to default
to the managed typemap. Now that trimmable is the NativeAOT default, the target is
skipped and no afterlink/ directory is produced, so skip the NativeAOT case (same
pattern as other NativeAOT test skips in this PR).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 94f450c7-781d-4019-a56c-fae1c456b9a7

Author: simonrozsival

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/IncrementalBuildTest.cs

@@ -1847,6 +1847,9 @@ public void AfterILLinkAdditionalStepsIsSkippedOnSecondBuild ([Values (AndroidRu
 			if (IgnoreUnsupportedConfiguration (runtime, release: isRelease)) {
 				return;
 			}
+			if (IgnoreOnNativeAot (runtime, "the trimmable typemap (the NativeAOT default) generates the typemap at compile time, so `_RunAfterILLinkAdditionalSteps` is intentionally skipped and no `afterlink/` output is produced.")) {
+				return;
+			}
 
 			var proj = new XamarinAndroidApplicationProject {
 				IsRelease = isRelease,