Fix hbase-connectors for release scripts

During the release for hbase-connectors 1.0.1 HBASE-28161, I found several issues

1. CHANGELOG.md was being used but our release script is using CHANGES.md to create new changes, see https://github.com/apache/hbase/blob/master/dev-support/create-release/release-util.sh#L578-L584
2. the do-release.sh script isn't working because of due 1/, I hacked it to make it work, but this would bring a backward compatible issues because no matter what the archive https://archive.apache.org/dist/hbase/hbase-connectors-1.0.0/ does not have the CHANGES.md for hbase-connectors.

Proposing to fix it after the releases,