Make "Add operator modifier" an inspection instead of intention

#KT-31533 Fixed

idea/testData/inspectionsLocal/addOperatorModifier/forOverride.kt

@@ -0,0 +1,9 @@
+open class A {
+    open fun plus(other: A): A = A()
+}
+
+class B : A() {
+    override fun <caret>plus(other: A): A {
+        return super.plus(other)
+    }
+}