JS: add test to prove that KT-14419 is not more reproducible. Add test to prove that extension delegate with extension getValue is translated correctly.

compiler/testData/codegen/box/delegatedProperty/extensionDelegatesWithSameNames.kt

@@ -0,0 +1,14 @@
+open class C
+
+object O : C()
+
+object K : C()
+
+class D(val value: String) {
+    operator fun getValue(thisRef: C, property: Any): String = value
+}
+
+val O.prop by D("O")
+val K.prop by D("K")
+
+fun box() = O.prop + K.prop

compiler/testData/codegen/box/delegatedProperty/extensionPropertyAndExtensionGetValue.kt

@@ -0,0 +1,13 @@
+class A(val o: String)
+
+interface I {
+    val k: String
+}
+
+inline operator fun A.getValue(thisRef: I, property: Any): String = o + thisRef.k
+
+class B(override val k: String) : I
+
+val B.prop by A("O")
+
+fun box() = B("K").prop