[java-decompiler] IDEA-326015 Support common cases of deconstruction in switch

- not hide variables, which have names
 - fix tests

GitOrigin-RevId: e60ff327233eb3d26f2b3fafcbb034fcce420e80

plugins/java-decompiler/engine/testData/bulk/pkg/res/Loader.java

@@ -18,7 +18,8 @@ public class Loader {
             stream.close();
             return new String(bytes, "UTF-8");
          } catch (Exception var5) {
-            throw new RuntimeException("Resource load failed", var5);
+            Exception e = var5;
+            throw new RuntimeException("Resource load failed", e);
          }
       }
    }