SLVS-1433 Add credentials uri to the ServerConnection model (#5660)

[SLVS-1433](https://sonarsource.atlassian.net/browse/SLVS-1433)

[SLVS-1433]:
https://sonarsource.atlassian.net/browse/SLVS-1433?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

src/Core.UnitTests/Binding/ServerConnectionTests.cs

@@ -27,9 +27,9 @@ namespace SonarLint.VisualStudio.Core.UnitTests.Binding;
 [TestClass]
 public class ServerConnectionTests
 {
-    private static readonly Uri Localhost = new Uri("http://localhost:5000");
+    private static readonly Uri Localhost = new("http://localhost:5000");
     private const string Org = "myOrg";
-
+    
     [TestMethod]
     public void Ctor_SonarCloud_NullOrganization_Throws()
     {
@@ -66,6 +66,7 @@ public void Ctor_SonarCloud_SetsProperties()
         sonarCloud.ServerUri.Should().Be(new Uri("https://sonarcloud.io"));
         sonarCloud.Settings.Should().BeSameAs(serverConnectionSettings);
         sonarCloud.Credentials.Should().BeSameAs(credentials);
+        sonarCloud.CredentialsUri.Should().Be(new Uri($"https://sonarcloud.io/organizations/{sonarCloud.OrganizationKey}"));
     }
 
     [TestMethod]
@@ -103,6 +104,7 @@ public void Ctor_SonarQube_SetsProperties()
         sonarQube.ServerUri.Should().BeSameAs(Localhost);
         sonarQube.Settings.Should().BeSameAs(serverConnectionSettings);
         sonarQube.Credentials.Should().BeSameAs(credentials);
+        sonarQube.CredentialsUri.Should().BeSameAs(sonarQube.ServerUri);
     }
 
     [TestMethod]

src/Core/Binding/ServerConnection.cs

@@ -29,6 +29,7 @@ public abstract class ServerConnection
     public ICredentials Credentials { get; set; }
 
     public abstract Uri ServerUri { get; }
+    public abstract Uri CredentialsUri { get; }
 
     public static ServerConnection FromBoundSonarQubeProject(BoundSonarQubeProject boundProject) =>
         boundProject switch
@@ -44,18 +45,25 @@ private ServerConnection(string id, ServerConnectionSettings settings = null, IC
         Settings = settings ?? DefaultSettings;
         Credentials = credentials;
     }
-
-    public sealed class SonarCloud(string organizationKey, ServerConnectionSettings settings = null, ICredentials credentials = null)
-        : ServerConnection(organizationKey, settings, credentials)
+
+    public sealed class SonarCloud : ServerConnection
     {
-        public string OrganizationKey { get; } = organizationKey;
+        public SonarCloud(string organizationKey, ServerConnectionSettings settings = null, ICredentials credentials = null) : base(organizationKey, settings, credentials)
+        {
+            OrganizationKey = organizationKey ?? throw new ArgumentNullException(nameof(organizationKey));
+            CredentialsUri = new Uri(ServerUri, $"organizations/{organizationKey}");
+        }
+
+        public string OrganizationKey { get; } 
 
-        public override Uri ServerUri { get; } = new Uri("https://sonarcloud.io");
+        public override Uri ServerUri { get; } = new("https://sonarcloud.io");
+        public override Uri CredentialsUri { get; }
     }
 
     public sealed class SonarQube(Uri serverUri, ServerConnectionSettings settings = null, ICredentials credentials = null)
         : ServerConnection(serverUri?.ToString(), settings, credentials)
     {
         public override Uri ServerUri { get; } = serverUri;
+        public override Uri CredentialsUri { get; } = serverUri;
     }
 }