User Story 38131: Stress Tests CI

- Fixed assert related to database usernames.

Author: paulmedynski

src/Microsoft.Data.SqlClient/tests/StressTests/SqlClient.Stress.Framework/DataSource.cs

@@ -162,8 +162,12 @@ internal SqlServerDataSource(string name, bool isDefault, IDictionary<string, st
             else
                 SupportsWindowsAuthentication = false;
 
-            if (string.IsNullOrEmpty(User) && !SupportsWindowsAuthentication)
-                throw new ArgumentException("SQL Server settings should include either a valid User name or SupportsWindowsAuthentication=true");
+            if (string.IsNullOrEmpty(EntraIdUser)
+                && string.IsNullOrEmpty(User)
+                && !SupportsWindowsAuthentication)
+            {
+                throw new ArgumentException("SQL Server settings should include either a valid user or SupportsWindowsAuthentication=true");
+            }
         }
 
         public override void Emit(byte indent)