fix(telemetry): give heatmap panels the options the plugin requires

Every heatmap carried only `tooltip` and `yAxis`, missing `calculate`, `color`
and `cellGap`. Grafana's heatmap plugin treats those as required, and without
them the panel fails to initialise: the dashboard opens with "An error occurred
within the plugin" rather than a chart.

The option values are taken from the one heatmap in this stack that does render
on Grafana Cloud (ledger-sync-health): calculate=false since the queries already
return histogram buckets, the Turbo 64-step scheme, and cellGap=1. Each panel
keeps its own yAxis label, unit and tooltip settings.

This is a long-standing defect rather than fallout from the recent layout work -
the same options are absent in origin/phase9 and in the cloud copies that were
already live.

docker/telemetry/grafana/dashboards/consensus-health.json

@@ -474,6 +474,16 @@
         "y": 52
       },
       "options": {
+        "calculate": false,
+        "cellGap": 1,
+        "color": {
+          "mode": "scheme",
+          "scheme": "Turbo",
+          "steps": 64
+        },
+        "legend": {
+          "show": true
+        },
         "tooltip": {
           "mode": "multi",
           "sort": "desc",

docker/telemetry/grafana/dashboards/ledger-operations.json

@@ -159,6 +159,16 @@
         "y": 11
       },
       "options": {
+        "calculate": false,
+        "cellGap": 1,
+        "color": {
+          "mode": "scheme",
+          "scheme": "Turbo",
+          "steps": 64
+        },
+        "legend": {
+          "show": true
+        },
         "tooltip": {
           "mode": "multi",
           "sort": "desc",

docker/telemetry/grafana/dashboards/rpc-performance.json

@@ -236,6 +236,16 @@
         "y": 20
       },
       "options": {
+        "calculate": false,
+        "cellGap": 1,
+        "color": {
+          "mode": "scheme",
+          "scheme": "Turbo",
+          "steps": 64
+        },
+        "legend": {
+          "show": true
+        },
         "tooltip": {
           "mode": "multi",
           "sort": "desc",

docker/telemetry/grafana/dashboards/transaction-overview.json

@@ -263,6 +263,16 @@
         "y": 30
       },
       "options": {
+        "calculate": false,
+        "cellGap": 1,
+        "color": {
+          "mode": "scheme",
+          "scheme": "Turbo",
+          "steps": 64
+        },
+        "legend": {
+          "show": true
+        },
         "tooltip": {
           "mode": "multi",
           "sort": "desc",