Remove backend tests on old inference

Also remove any mentions of NewInference, and rename some tests.

compiler/testData/codegen/box/callableReference/bound/boundReferenceToOverloadedFunction.kt

@@ -1,6 +1,3 @@
-
-// !LANGUAGE: +NewInference
-
 interface JsonParser
 interface JsonCodingParser : JsonParser
 
@@ -23,4 +20,4 @@ class Test {
 fun box(): String {
     Test().fooTest()
     return result
-}
+}