FE 1.0: implement typed this label resolve warning for KT-51433

#KT-51433 Fixed

compiler/testData/diagnostics/testsWithStdLib/labelClashesWithContextReceivers.fir.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +ContextReceivers
+
+class Some {
+    context(Some, String)
+    fun foo() {
+        this<!UNRESOLVED_LABEL!>@foo<!>
+        this@Some
+        this<!UNRESOLVED_LABEL!>@String<!>
+    }
+
+    context(Some)
+    val self: Some
+        get() = this@Some
+}