Remove backend tests on old inference

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

compiler/testData/ir/irText/expressions/callableReferences/caoWithAdaptationForSam.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND_FIR: JVM_IR
-// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType +FunctionalInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
 
 fun interface IFoo {
     fun foo(i: Int)
@@ -45,4 +44,4 @@ fun test6(a: Any) {
     a as (Int) -> Unit
     a as IFoo
     A[a] += 1
-}
+}