[SAM with receiver] Partially migrate tests to new infrastructure

Script tests still use old infrastructure, because there is no support
  for them in new framework

plugins/sam-with-receiver/testData/diagnostics/samConversionSimpleWithoutAnnotation.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER,-UNUSED_VARIABLE
+// FIR_IDENTICAL
 
 // FILE: Sam.java
 public interface Sam {
@@ -16,4 +16,4 @@ fun test() {
 
     e.exec { a -> System.out.println(a) }
     e.exec { System.out.println(<!NO_THIS!>this<!>) }
-}
+}