java redundant cast: preserve multiple type casts around functional interface when if expected type is the same as cast

isAssignable check may fail otherwise

GitOrigin-RevId: d02c9d50645a2bbb0e957f077a4a66813c94afd6

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/redundantCast/RawMiddleMan.java

@@ -0,0 +1,14 @@
+
+import java.util.function.Function;
+
+abstract class MyTest {
+  public <T> T m() {
+    //noinspection unchecked
+    return (T)(Function)t -> t;
+  }
+  
+  public Function m1() {
+    //noinspection unchecked
+    return (<warning descr="Casting '(Function)t -> {...}' to 'Function' is redundant">Function</warning>)(<warning descr="Casting 't -> {...}' to 'Function' is redundant">Function</warning>)t -> t;
+  }
+}