[utils][commands][daily_cron_actions] Add call for attestations cleanup

The cleanup command was called as part of the warning sending
which is reversed logic, therefore the warning command now does
just the sending part and a call to clean_attestations has
been added here.
1 job for 558_attestations_fix_url_prefix_usage in 15 minutes and 29 seconds
Name Stage Failure
build_linux_36 Build
  File "/scratch/builds/iJyPBhV4/2/beat/beat.web/miniconda/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2471, in load
self.require(*args, **kwargs)
File "/scratch/builds/iJyPBhV4/2/beat/beat.web/miniconda/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2494, in require
items = working_set.resolve(reqs, env, installer, extras=self.extras)
File "/scratch/builds/iJyPBhV4/2/beat/beat.web/miniconda/lib/python3.7/site-packages/pkg_resources/__init__.py", line 785, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'importlib-metadata; python_version < "3.8"' distribution was not found and is required by twine

ERROR: Job failed: exit status 1