Define a chat responder for the Slack app
What does this MR do?
This ensures that the Slack application service can be used with chatops by defining the proper chat responder.
This fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/5383
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
End-to-end tests pass ( package-qamanual pipeline job)