DGPv2: Fix isMetadata flag (#4263)

* Reproduce kotlinx.io issue with `cnames` usage
* Update IT expected data after the `isMetadata` flag is fixed
* Update IT expected data for `cnames` usage

Author: whyoleg

dokka-integration-tests/gradle/projects/it-kotlin-multiplatform/build.gradle.kts

@@ -9,4 +9,9 @@ kotlin {
     linuxArm64()
     iosX64()
     iosArm64()
+
+    androidNativeArm32()
+    androidNativeArm64()
+    androidNativeX64()
+    androidNativeX86()
 }