Update dependency-on-stubs build.gradle to use AGP

There were several issues with the dependency-on-stubs build.gradle:

1) The original intent of this test is to ensure that the runtime classpath
does not contain the android-all jar, but the android-all was explicitly being
used in the runtime classpath.

2) The android-29 stubs jar was hardcoded in the dependency-on-stubs
build.gradle. It is not guaranteed that android-29 will be installed.

Update the dependency-on-stubs to use AGP, and remove the runtime dependency on
android-all.

Fixes #8962

PiperOrigin-RevId: 622020695

integration_tests/dependency-on-stubs/build.gradle

@@ -1,18 +1,30 @@
-import org.robolectric.gradle.RoboJavaModulePlugin
+import org.robolectric.gradle.AndroidProjectConfigPlugin
 
-apply plugin: RoboJavaModulePlugin
+apply plugin: 'com.android.library'
+apply plugin: AndroidProjectConfigPlugin
 
 // test with a project that depends on the stubs jar, not org.robolectric:android-all
 
-dependencies {
-    api project(":robolectric")
-    api libs.junit4
+android {
+    compileSdk 33
+    namespace 'org.robolectric'
+
+    defaultConfig {
+        minSdk 19
+        targetSdk 33
+    }
 
-    testImplementation files("${System.getenv("ANDROID_HOME")}/platforms/android-29/android.jar")
+    compileOptions {
+        sourceCompatibility = '1.8'
+        targetCompatibility = '1.8'
+    }
 
-    testCompileOnly AndroidSdk.MAX_SDK.coordinates // compile against latest Android SDK
-    testRuntimeOnly AndroidSdk.MAX_SDK.coordinates
+    testOptions.unitTests.includeAndroidResources true
+}
+
+dependencies {
+    testImplementation project(":robolectric")
+    testImplementation libs.junit4
     testImplementation libs.truth
-    testImplementation libs.mockito
     testImplementation libs.hamcrest.junit
 }