feat(telemetry): split perf-run annotations by load driver on ledger-sync-health

Apply the same two-layer split as the other dashboards to the sync-health board,
which is introduced on this branch: `Perf Runs (JMeter)` and
`Perf Runs (Locust)`, each matching ["perf-iac", "<driver>"] with
matchAny:false, in place of the single generic `perf-iac` layer.

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

@@ -20,12 +20,29 @@
         },
         "enable": true,
         "hide": false,
-        "iconColor": "rgb(70, 70, 70)",
-        "name": "Annotate perf-iac runs",
+        "iconColor": "rgb(144, 133, 233)",
+        "name": "Perf Runs (JMeter)",
         "target": {
           "limit": 100,
           "matchAny": false,
-          "tags": ["perf-iac"],
+          "tags": ["perf-iac", "jmeter"],
+          "type": "tags"
+        },
+        "type": "tags"
+      },
+      {
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
+        "enable": true,
+        "hide": false,
+        "iconColor": "rgb(25, 158, 112)",
+        "name": "Perf Runs (Locust)",
+        "target": {
+          "limit": 100,
+          "matchAny": false,
+          "tags": ["perf-iac", "locust"],
           "type": "tags"
         },
         "type": "tags"