Remove redis-ratelimiting external secret.
What does this MR do?
We've removed all of the references to redis-ratelimiting as we're tearing down that environment (gitlab-com/gl-infra/scalability#2003) and this should remove the last of it.
Once this is complete, I will delete the values out of vault.
Tagging Pierre to review, as he made some changes to this after our last work, and I'd like to confirm this is the right way to do this.
Author Check-list
Please read the Contributing document and once you do, complete the following:
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Check if all of the following apply: - Assign to the correct reviewer per the contributing document
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- Link to related MRs for applying the changes on other environments
- Link to related Chef changes
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Reviewer Check-list
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Check if all of the following apply: - Reviewed the diff jobs to confirm changes are as expected
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Applier Check-list
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Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)