[java][switch completion] IDEA-271902 Fix the completion tail in case labels

Make SwitchUtils#isRuleFormatSwitch return true regardless if the passed switch block is used in a statement or an expression context.

GitOrigin-RevId: fce50d7a2e2936e6653b2eae1509e6c1fe76d7ad

java/java-tests/testData/codeInsight/completion/normal/CompleteConstantInSwitchStmt_after.java

@@ -3,7 +3,7 @@ class Main {
   private static final int LEVEL = 0;
   void f(Object o) {
     switch(o) {
-        case LEVEL:<caret>
+        case LEVEL -> <caret>
     }
   }
 }