Remove backend tests on old inference

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

compiler/testData/ir/irText/expressions/funInterface/samConversionOnCallableReference.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +NewInference +FunctionalInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
 fun interface KRunnable {
     fun run()
 }
@@ -22,4 +21,4 @@ fun testSamConversion() {
 // TODO should use an adapter function
 fun testSamConversionOnAdapted() {
     use(::foo1)
-}
+}