Remove actioncable scenario code
What does this MR do and why?
Describe in detail what your merge request does and why.
Removes test code for deprecated and removed gitlab functionality.
Related to: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1324
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Andrejs Cunskis