Improves security issues processing message
What does this MR do?
Improves and refactor the security issues processing message posted in Slack when executing /chatops run release merge --security
by:
- Reducing the verbosity of the message and,
- Skipping "Finished processing" message when there's nothing to process
Example
Related to https://gitlab.com/gitlab-org/release-tools/-/issues/441 and to https://gitlab.com/gitlab-org/release-tools/-/issues/440
Edited by Mayra Cabrera