Remove migrated irc-meetings jobs
The legacy job was migrated to a native v3 in-tree job.
Remove the legacy job.
Needed-By:
Depends-On:
check:
jobs:
- openstack-tox-pep8
- - legacy-irc-meetings-tox-ical
gate:
jobs:
- openstack-tox-pep8
- - legacy-irc-meetings-tox-ical
post:
jobs:
- publish-irc-meetings
