Only use RspecFlaky::Listener when 'FLAKY_RSPEC_GENERATE_REPORT' is set
What does this MR do?
This should allow to get rid of the ! Generating reports is disabled. To enable it, please set the
FLAKY_RSPEC_GENERATE_REPORT=1 !
warning in job logs, e.g. https://gitlab.com/gitlab-org/gitlab/-/jobs/428117998.
Edited by Rémy Coutable