feat: Allow creating redis.action_cable.yml

What does this MR do?

feat: Allow creating redis.action_cable.yml

Used to migrate from the cluster specified in cable.yml

Related to gitlab-com/gl-infra/tenant-scale/tenant-services&41 (closed)

Author checklist

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Required

For anything in this list which will not be completed, please provide a reason in the MR discussion.

  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.
    • This is a GitLab.com-specific feature (used to migrate one cluster to another), there's no need to include it in Omnibus.

Reviewers checklist

Edited by Ahmad Sherif

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