Client ingegration tests fails for branch-2/branch-2.6

In HBASE-28331, we fixed the problem that we should use the latest hadoop3 tarballs, for generating hdfs-site.xml.

But for branch-2.x, we still use hadoop2 when compiling hbase by default, so there is no org.apache.hadoop.ipc.ProtobufRpcEngine2 class. But the hadoop 3.3.x will generate hdfs-site.xml with this config, then leads to the failure of hbase start up.

Should we change to build with hadoop3 while running on top of hadoop3? Since for branch-2.x, we will publish artifacts for hadoop3.