Fix code scanning alert

Exposure of private information

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

src/WebApp/Pages/Account/ExternalLogin.cshtml.cs

@@ -165,25 +165,24 @@ private async Task<IActionResult> CreateUserAndSignInAsync(ExternalLoginInfo inf
         var createUserResult = await userManager.CreateAsync(user);
         if (!createUserResult.Succeeded)
         {
-            logger.LogWarning("Failed to create new user {UserName}", user.Email.MaskEmail());
+            logger.LogWarning("Failed to create new user with object ID {ObjectId}", user.ObjectIdentifier);
             return await FailedLoginAsync(createUserResult, user);
         }
 
-        logger.LogInformation("Created new user {Email} with object ID {ObjectId}",
-            user.Email.MaskEmail(), user.ObjectIdentifier);
+        logger.LogInformation("Created new user with object ID {ObjectId}", user.ObjectIdentifier);
 
         // Add new user to application Roles if seeded in app settings or local admin user setting is enabled.
         var seedAdminUsers = configuration.GetSection("SeedAdminUsers").Get<string[]>();
         if (AppSettings.DevSettings.LocalUserIsStaff)
         {
-            logger.LogInformation("Seeding staff role for new user {Email}", user.Email.MaskEmail());
+            logger.LogInformation("Seeding staff role for new user with object ID {ObjectId}", user.ObjectIdentifier);
             await userManager.AddToRoleAsync(user, RoleName.Staff);
         }
 
         if (AppSettings.DevSettings.LocalUserIsAdmin ||
             (seedAdminUsers != null && seedAdminUsers.Contains(user.Email, StringComparer.InvariantCultureIgnoreCase)))
         {
-            logger.LogInformation("Seeding all roles for new user {Email}", user.Email.MaskEmail());
+            logger.LogInformation("Seeding all roles for new user with object ID {ObjectId}", user.ObjectIdentifier);
             foreach (var role in AppRole.AllRoles) await userManager.AddToRoleAsync(user, role.Key);
         }