Remove backend tests on old inference

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

compiler/testData/codegen/box/controlStructures/tryFinallyGeneric.kt

@@ -1,6 +1,5 @@
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
-// !LANGUAGE: +NewInference
 
 val stack = mutableListOf<Int>()
 
@@ -22,4 +21,4 @@ fun box(): String {
     } else {
         return "OK"
     }
-}
+}