Add separate IP based rate limiting for chat domain #2702
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At the moment all traffic that comes into the backend load balancer is subject to an IP based rate limiting at the WAF level. This is a problem for chat as we expect all traffic to come from a single source of traffic -the gov.uk app- therefore to solve this issue and add more flexibility in controlling the traffic for chat we add new rules that introduce a separate rate limiting when traffic is going towards the chat domain