Upgrade Redis version and increase Memory

[ninosamson]

The current Redis Cluster has been causing issues eventually and requires manual intervention. An effort should be executed to ensure the cluster is correctly configured, can support eventual faulted nodes, and recover without intervention. Also, the amount of resources allocated to execute the cluster can potentially be pretty low and must be adjusted.

• Upgrade Redis version. Review whether an upgrade to the latest version can be applied. Otherwise, we can upgrade to the most recent and backward-compatible version and plan a major upgrade later.
• Check the current resource configuration for Redis Cluster execution. This document can be a starting point.
• Review the current cluster structure (3 masters, 3 slaves) to revalidate if it is still the best approach. It seems that losing one node is making the entire cluster unstable and requiring manual intervention.
• Try to find references in other BC Gov projects and the BC Gov community.
• If Change Redis Persistence to RDB #2459 isn't completed it can be done as part of this effort, time allowing.

[CarlyCotton]

Likely a timeboxed activity as analysis is required. Should do sooner than later but may not have time for 2.4 release.

[ninosamson]

Tagging to 2.5 as we pulled this into sprint late to get a head start.