[tests] javadoc highlighting tests merger and cleanup

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

@@ -0,0 +1,9 @@
+class Test {
+  /**
+   * Test.
+   * @param s my string
+   * <warning descr="Duplicate @param tag for parameter 's'">@param</warning> s another string
+   */
+  void test(String s) {
+  }
+}