refactor(telemetry): default the $service_name dashboard filter to 'xrpld'

Continuation of the same default change applied on phase-6-statsd
(50d7047abe): the 5 dashboards introduced on phase-7 (formerly
system-*, renamed to bare names on this branch) also get their
service_name filter pre-selected to 'xrpld' instead of 'All'.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker/telemetry/grafana/dashboards/ledger-data-sync.json

@@ -509,8 +509,8 @@
         "includeAll": true,
         "allValue": ".*",
         "current": {
-          "text": "All",
-          "value": "$__all"
+          "text": "xrpld",
+          "value": "xrpld"
         },
         "multi": true,
         "refresh": 2,

docker/telemetry/grafana/dashboards/network-traffic.json

@@ -787,8 +787,8 @@
         "includeAll": true,
         "allValue": ".*",
         "current": {
-          "text": "All",
-          "value": "$__all"
+          "text": "xrpld",
+          "value": "xrpld"
         },
         "multi": true,
         "refresh": 2,

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

@@ -909,8 +909,8 @@
         "includeAll": true,
         "allValue": ".*",
         "current": {
-          "text": "All",
-          "value": "$__all"
+          "text": "xrpld",
+          "value": "xrpld"
         },
         "multi": true,
         "refresh": 2,

docker/telemetry/grafana/dashboards/overlay-traffic-detail.json

@@ -569,8 +569,8 @@
         "includeAll": true,
         "allValue": ".*",
         "current": {
-          "text": "All",
-          "value": "$__all"
+          "text": "xrpld",
+          "value": "xrpld"
         },
         "multi": true,
         "refresh": 2,

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

@@ -608,8 +608,8 @@
         "includeAll": true,
         "allValue": ".*",
         "current": {
-          "text": "All",
-          "value": "$__all"
+          "text": "xrpld",
+          "value": "xrpld"
         },
         "multi": true,
         "refresh": 2,