[FE] Temporary disable exhaustiveness checker for java sealed classes

KT-43551
KT-41215

compiler/testData/diagnostics/testsWithJava15/sealedClasses/javaSealedInterfaceExhaustiveness.kt

@@ -21,7 +21,7 @@ public enum E implements Base {
 
 // FILE: main.kt
 fun test_ok_1(base: Base) {
-    val x = when (base) {
+    val x = <!NO_ELSE_IN_WHEN!>when<!> (base) {
         is A -> 1
         is B -> 2
         is E -> 3
@@ -29,7 +29,7 @@ fun test_ok_1(base: Base) {
 }
 
 fun test_ok_2(base: Base) {
-    val x = when (base) {
+    val x = <!NO_ELSE_IN_WHEN!>when<!> (base) {
         is A -> 1
         is B.C -> 2
         is B.D -> 3