Support AGP with Kotlin BuiltIn

- Update KotlinAdapter and AndroidAdapter to handle AGP with Kotlin built-in.
- Add integration tests.
- Update integration test infra to support filtering out AGP 9.

Author: adam-enko

dokka-integration-tests/gradle/projects/it-android-kotlin-jvm-builtin/build.gradle.kts

@@ -0,0 +1,26 @@
+plugins {
+    id("com.android.library") version "/* %{AGP_VERSION} */"
+    id("org.jetbrains.dokka") version "/* %{DGP_VERSION} */"
+    //kotlin("android") version "/* %{KGP_VERSION} */"
+}
+
+android {
+    namespace = "org.jetbrains.dokka.it.android"
+    compileSdk = 33
+    defaultConfig {
+        minSdk = 21
+    }
+}
+
+dependencies {
+    implementation("androidx.appcompat:appcompat:1.1.0")
+}
+
+// WORKAROUND https://github.com/Kotlin/dokka/issues/3701
+afterEvaluate {
+    dokka.dokkaSourceSets
+        .matching { it.name == "debug" }
+        .configureEach {
+            sourceRoots.setFrom(emptyList<String>())
+        }
+}