FIR: Mute builder-inference related tests

They started failing once we began reporting diagnostics from completion

^KT-46421 Relates

compiler/testData/codegen/box/inference/builderInference/callableReferencesProperCompletion.kt

@@ -1,5 +1,6 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WITH_RUNTIME
+// IGNORE_BACKEND_FIR: JVM_IR
 
 fun nonGenericId(x: Any?) = x
 
@@ -69,4 +70,4 @@ fun box(): String {
     test8()
     test9()
     return "OK"
-}
+}