Add unit tests for RabbitMq and Udp transport servers and clients

- Implemented comprehensive unit tests for RabbitMqTransportServer, covering constructor, disposal, connection management, event handlers, and exception handling.
- Added configuration tests for RabbitMqTransportServer to validate SSL, durable queues, auto-recovery, and custom virtual host options.
- Created unit tests for UdpFrameProtocol, including frame parsing and serialization, header size validation, and round-trip data preservation.
- Developed tests for UdpTransportClient, focusing on connection handling, event subscriptions, and exception scenarios.
- Established tests for UdpTransportServer, ensuring proper start/stop behavior, connection state management, and event handling.
- Included tests for UdpTransportOptions to verify default values and modification capabilities.
- Enhanced service registration tests for Udp transport services in the dependency injection container.

src/__Libraries/__Tests/StellaOps.Microservice.Tests/HeaderCollectionTests.cs

@@ -361,9 +361,9 @@ public sealed class HeaderCollectionTests
 
         // Assert
         list.Should().HaveCount(3);
-        list.Should().Contain(new KeyValuePair<string, string>("Content-Type", "application/json"));
-        list.Should().Contain(new KeyValuePair<string, string>("Accept", "text/plain"));
-        list.Should().Contain(new KeyValuePair<string, string>("Accept", "text/html"));
+        list.Should().Contain(kvp => kvp.Key == "Content-Type" && kvp.Value == "application/json");
+        list.Should().Contain(kvp => kvp.Key == "Accept" && kvp.Value == "text/plain");
+        list.Should().Contain(kvp => kvp.Key == "Accept" && kvp.Value == "text/html");
     }
 
     [Fact]