chore(webapp): consolidate the queue metrics server-change notes into one (TRI-12068)

Merge the queue-metrics dashboard, live/clarity and override-limit notes into a single short release note. Leaves the unrelated notes (side menu, agent detail, duplicate-root-environments) from the base branch untouched.

Author: samejr

.server-changes/queue-metrics-dashboard.md

@@ -3,4 +3,4 @@ area: webapp
 type: feature
 ---
 
-Queue metrics and health on the Queues page: per-queue depth, throughput, concurrency, throttling, and scheduling-delay charts, plus a per-queue detail view, live queue stats and a backlog chart on the task detail page, and a waiting-in-queue explainer in the run inspector for runs that have not started yet. Off by default; enabled per organization.
+New Queue metrics & health dashboard (per-org opt-in): per-queue depth, throughput, concurrency, throttling and scheduling-delay charts, a per-queue detail view, and live queue stats. Queue concurrency limits set above the environment limit are now rejected instead of being silently capped.