Generate Secondary Constructor: Forbid inside of class with explicit primary constructor

idea/testData/codeInsight/generate/secondaryConstructors/primaryExists.kt

@@ -0,0 +1,13 @@
+// ACTION_CLASS: org.jetbrains.kotlin.idea.actions.generate.KotlinGenerateSecondaryConstructorAction
+// NOT_APPLICABLE
+class Foo(x: Int) {<caret>
+    val x: Int
+
+    fun foo() {
+
+    }
+
+    fun bar() {
+
+    }
+}