fix: wire DCL connection state changes into ISiteHealthCollector

DataConnectionActor now calls UpdateConnectionHealth() on state
transitions (Connecting/Connected/Reconnecting) and UpdateTagResolution()
on connection establishment. DataConnectionManagerActor calls
RemoveConnection() on actor removal. Health reports now include
data connection statuses when instances are deployed with bindings.

tests/ScadaLink.DataConnectionLayer.Tests/DataConnectionActorTests.cs

@@ -5,6 +5,7 @@ using ScadaLink.Commons.Interfaces.Protocol;
 using ScadaLink.Commons.Messages.DataConnection;
 using ScadaLink.Commons.Types.Enums;
 using ScadaLink.DataConnectionLayer.Actors;
+using ScadaLink.HealthMonitoring;
 
 namespace ScadaLink.DataConnectionLayer.Tests;
 
@@ -21,11 +22,13 @@ public class DataConnectionActorTests : TestKit
 {
     private readonly IDataConnection _mockAdapter;
     private readonly DataConnectionOptions _options;
+    private readonly ISiteHealthCollector _mockHealthCollector;
 
     public DataConnectionActorTests()
         : base(@"akka.loglevel = DEBUG")
     {
         _mockAdapter = Substitute.For<IDataConnection>();
+        _mockHealthCollector = Substitute.For<ISiteHealthCollector>();
         _options = new DataConnectionOptions
         {
             ReconnectInterval = TimeSpan.FromMilliseconds(100),
@@ -37,7 +40,7 @@ public class DataConnectionActorTests : TestKit
     private IActorRef CreateConnectionActor(string name = "test-conn")
     {
         return Sys.ActorOf(Props.Create(() =>
-            new DataConnectionActor(name, _mockAdapter, _options)), name);
+            new DataConnectionActor(name, _mockAdapter, _options, _mockHealthCollector)), name);
     }
 
     [Fact]