[java] highlight @snippet javadoc tag if not available at a given language level

GitOrigin-RevId: 7e2a20fbc52b2c8fa72018103ace9a5dc13aa454

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/javaDoc/Snippet.java

@@ -0,0 +1,6 @@
+/** {<warning descr="'@snippet' tag is not available at this language level"><warning descr="Wrong tag 'snippet'">@snippet</warning></warning> :
+ *  Body
+ * }
+ */
+class A {
+}