[java] restores multifaceted switch labels support (parser/PSI + basic highlighting)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting6/UnsupportedFeatures.java

@@ -29,6 +29,9 @@ class UnsupportedFeatures {
       <error descr="Enhanced 'switch' blocks are not supported at language level '6'">case 0 -> throw new IllegalStateException("empty list");</error>
       default -> System.out.println("it's okay");
     }
+    switch (list.size()) {
+      case <error descr="Enhanced 'switch' blocks are not supported at language level '6'">1, 2</error>:
+    }
   }
 
   void f(<error descr="Receiver parameters are not supported at language level '6'">Object this</error>) { }