[mixin] Operational dashboard is missing OTLP data

[lindeskar]

otlp_v1_logs|/httpgrpc.HTTP/Handle should probably be added to these queries:

loki/production/loki-mixin/dashboards/dashboard-loki-operational.json

Line 665 in 672f91c

"expr": "histogram_quantile(0.99, sum by (le) (cluster_job_route:loki_request_duration_seconds_bucket:sum_rate{job=~\"$namespace/cortex-gw(-internal)?\", route=~\"api_prom_push|loki_api_v1_push\", cluster=~\"$cluster\"})) * 1e3",

loki/production/loki-mixin/dashboards/dashboard-loki-operational.json

Line 670 in 672f91c

"expr": "histogram_quantile(0.75, sum by (le) (cluster_job_route:loki_request_duration_seconds_bucket:sum_rate{job=~\"$namespace/cortex-gw(-internal)?\", route=~\"api_prom_push|loki_api_v1_push\", cluster=~\"$cluster\"})) * 1e3",

loki/production/loki-mixin/dashboards/dashboard-loki-operational.json

Line 675 in 672f91c

"expr": "histogram_quantile(0.5, sum by (le) (cluster_job_route:loki_request_duration_seconds_bucket:sum_rate{job=~\"$namespace/cortex-gw(-internal)?\", route=~\"api_prom_push|loki_api_v1_push\", cluster=~\"$cluster\"})) * 1e3",