JS: move more test to box tests

js/js.translator/testData/box/nameClashes/extensionFunctionAndProperty.kt

@@ -0,0 +1,18 @@
+package foo
+
+public fun <T> List<T>.some(): T = this[0]
+public fun String.some(): Char = this[0]
+public val <T> List<T>.some: T get() = this[1]
+public val String.some: Char get() = this[1]
+
+fun box(): String {
+
+    val data = listOf("foo", "bar")
+
+    assertEquals("foo", data.some())
+    assertEquals("bar", data.some)
+    assertEquals('f', "foo".some())
+    assertEquals('a', "bar".some)
+
+    return "OK"
+}