[Test] Migrate Parcelize tests to new test infrastructure

plugins/parcelize/parcelize-compiler/testData/codegen/customDescribeContents.kt

@@ -1,4 +1,4 @@
-// CURIOUS_ABOUT describeContents
+// CURIOUS_ABOUT: describeContents
 // WITH_RUNTIME
 
 import kotlinx.parcelize.*
@@ -7,4 +7,4 @@ import android.os.Parcelable
 @Parcelize
 class User(val firstName: String, val lastName: String, val age: Int, val isProUser: Boolean) : Parcelable {
     override fun describeContents() = 100
-}
+}