release: remove rc-announce, add release:status
Created by: bobheadxi
Removes announcement of release candidates, but I still think the blocking issue announcment might be useful, so I added release:status
- maybe we can replace https://github.com/sourcegraph/sourcegraph/issues/13869 with this? Not putting this command in any of the steps for now
Closes https://github.com/sourcegraph/sourcegraph/issues/13875