[Refactor]: Replace enableAndroidTest with androidTest.enable (#1274)

This is because enableAndroidTest is deprecated.

Fixes #1272

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/AndroidInstrumentedTests.kt

@@ -30,6 +30,6 @@ import org.gradle.api.Project
 internal fun LibraryAndroidComponentsExtension.disableUnnecessaryAndroidTests(
     project: Project,
 ) = beforeVariants {
-    it.enableAndroidTest = it.enableAndroidTest
+    it.androidTest.enable = it.androidTest.enable
         && project.projectDir.resolve("src/androidTest").exists()
 }