Go to (show) implementations: skip light methods that are generated with DELEGATION or DELEGATION_TO_DEFAULT_IMPLS JvmDeclarationOriginKind

Add some unrelated tests for fake overrides

idea/testData/navigation/implementations/DefaultImplFunction.kt

@@ -0,0 +1,26 @@
+package testing
+
+interface I {
+    fun <caret>f() {
+
+    }
+}
+
+class A : I
+
+class B : I {
+    override fun f() {
+    }
+}
+
+class C : I
+
+interface II: I
+interface III: I {
+    override fun f() {
+    }
+}
+
+// REF: (in testing.B).f()
+// REF: (in testing.III).f()
+