missing PR branch incorrectly implemented

[jctanner]

https://github.com/ansible/ansibullbot/commit/14bc5dceb91817888c4a3a68dd27d5f40edd97e2#diff-b206352f3de977e805cb5daa6f314c53R765

1. all of the code in ansible.py needs to be moved to a plugin file in triagers/plugins
2. the return from the plugin should be facts that indicate if the comment should be added and if the issue should be closed
3. the historywrapper should be used inside the plugin to check if the comment was already added
4. the duplicate comments across all the PRs need to be removed https://github.com/ansible/ansible/pull/45127
5. the instructions in the message should be moved to docs.ansible and the comment can link to it.

[jctanner]

https://github.com/ansible/ansibullbot/pull/1126 temporarily turns off the codeblock