fix(opcuaclient): upstream session loss goes Bad and recovers (#670)

A bad keep-alive now degrades health (LastSuccessfulRead preserved) and,
once per outage, publishes BadNoCommunication (value retained) for every
subscribed ref plus a quality-only annotation on subscribed alarm
conditions. Good keep-alives and data/event notifications advance
LastSuccessfulRead, so an idle-but-alive subscription never looks dead
to the #527 watchdog. A keep-alive that recovers on the same session
re-reads the Bad refs and republishes them Good; a session that does not
come back is recovered by the watchdog's ShutdownAsync + InitializeAsync
+ re-subscribe.

Deletes the SessionReconnectHandler wiring (it retried forever in SDK
1.5.378, cloned subscriptions the driver never re-tracked and kept health
Healthy), OnReconnectComplete, TryRearmReconnect and the reconnect_*
counters (new keepalive_recovered). Teardown of a lost session skips
wire deletes and bounds CloseSession. SDK warnings reach the driver log.
Wire test reworked: restart => Bad, then watchdog-style reinit => Good.

src/Core/ZB.MOM.WW.OtOpcUa.Commons/Observability/OtOpcUaTelemetry.cs

@@ -80,11 +80,11 @@ public static class OtOpcUaTelemetry
     /// Session/publish-level events of an OPC UA Client driver instance (#276): the operator's view of a
     /// flapping upstream. Tagged <see cref="PollOverrunDriverInstanceTag"/> (<c>driver_instance</c>) +
     /// <c>event</c> = <c>publish_response|notification|data_change|bad_status_value|publish_error|
-    /// keepalive_miss|reconnect_attempt|reconnect_success|reconnect_exhausted</c>.
+    /// keepalive_miss|keepalive_recovered</c>.
     /// </summary>
     public static readonly Counter<long> OpcUaClientEvents =
         Meter.CreateCounter<long>("otopcua.driver.opcuaclient.events", unit: "{event}",
-            description: "OPC UA Client driver session/publish events (event=publish_response|notification|data_change|bad_status_value|publish_error|keepalive_miss|reconnect_attempt|reconnect_success|reconnect_exhausted).");
+            description: "OPC UA Client driver session/publish events (event=publish_response|notification|data_change|bad_status_value|publish_error|keepalive_miss|keepalive_recovered).");
 
     // ---------------- VirtualTag / ScriptedAlarm engines ----------------