fix(prometheus): a refused token stops the scraping, as Home Assistant bans an address after a few refusals (#6355)

Also names the Home Assistant connection by its address in the audit log and
timeline, where its id showed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/prometheus/service.py

@@ -271,6 +271,9 @@ class TargetState:
 def target_state(target: PrometheusTarget, now: datetime) -> TargetState:
     if not target.enabled:
         return TargetState("paused", "Paused: not scraped until it's resumed.")
+    if target.refused:
+        return TargetState("down", f"{target.last_error} Steward stopped asking, as some services ban an "
+                                   "address after a few refusals. Save a new token to start again.")
     if target.last_scraped_at is None:
         return TargetState("pending", "Not scraped yet.")
     if (now - target.last_scraped_at).total_seconds() > STALE_SCRAPES * max(target.interval_seconds, 1):