Fix when changing only RuboCop files
What does this MR do and why?
Fix when changing only RuboCop files
When we're only changing RuboCop files, we're not running detect-tests
and then pipeline will become invalid. We really don't need it because
in that case, we set RUN_ALL_RUBOCOP
and then we're just running the
full RuboCop suite.
This fixes https://gitlab.com/gitlab-org/gitlab/-/pipelines/640317558
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Related to #373856 (closed)