Fix empty shotover_chain_latency metric

[rukai]

Because the registered shotover_chain_latency metric cant specify the client ip it ends up as a separate metric that is always 0 which is quite confusing.
e.g.

# TYPE shotover_chain_latency summary
shotover_chain_latency{chain="example_chain",quantile="0"} 0
shotover_chain_latency{chain="example_chain",quantile="0.5"} 0
shotover_chain_latency{chain="example_chain",quantile="0.9"} 0
shotover_chain_latency{chain="example_chain",quantile="0.95"} 0
shotover_chain_latency{chain="example_chain",quantile="0.99"} 0
shotover_chain_latency{chain="example_chain",quantile="0.999"} 0
shotover_chain_latency{chain="example_chain",quantile="1"} 0
shotover_chain_latency_sum{chain="example_chain"} 0
shotover_chain_latency_count{chain="example_chain"} 0
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0"} 0.000205255
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0.5"} 0.00023099834016288915
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0.9"} 0.00023099834016288915
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0.95"} 0.00023099834016288915
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0.99"} 0.00023099834016288915
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="0.999"} 0.00023099834016288915
shotover_chain_latency{chain="example_chain",client_details="127.0.0.1",quantile="1"} 0.000245891
shotover_chain_latency_sum{chain="example_chain",client_details="127.0.0.1"} 0.000682139
shotover_chain_latency_count{chain="example_chain",client_details="127.0.0.1"} 3

So instead lets just remove the register to avoid that.

Additionally process_request_rev was failing to specify the client_details which would have also been recorded in a separate metric.

An alternate approach would be to just remove the client_details from the metric but I assume that splitting the metrics up by client is useful?

[benbromhead]

Yup being able to see whats happening on a per client basis is super useful