Remove support for sticking to old and new keys
What does this MR do and why?
In !67773 (merged) we added support for multiple databases in the load balancer. This was released in 14.4. As part of these changes, we added support for reading/writing to both the old and new Redis keys, making it easier to switch between the old and new version of the code.
In this commit we remove the use of the old key format, as it's no longer needed.
This fixes #345208 (closed)
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