basic vetting of previously-existing release JIRA issue for plugin releaser

if the RM provides a previously-existing JIRA issue, ensure it has the right component (AllPlugins).

stevegill any other vetting of the JIRA issue the plugin releaser should do? And what if the JIRA issue does not pass the 'requirements'? Do we prompt the release manager if they want the JIRA issue updated? Or do we error and exit?