User: Add name and image URL (#6008)

* User: Add name and image URL

More personalization options, prerequisite for btcpayserver/app#3.

Additionally:
- Remove ambigious and read-only username from manage view.
- Improve email verification conditions and display.
- Greenfield: Update current user. Prerequisite for btcpayserver/app#13.

* Refactor UpdateCurrentUser

* Replace new columns by UserBlob

* Update email check and add test case for mailbox addresses

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Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>

BTCPayServer/Controllers/UIStoresController.Users.cs

@@ -137,9 +137,11 @@ public partial class UIStoresController
     {
         var users = await _storeRepo.GetStoreUsers(CurrentStore.Id);
         vm.StoreId = CurrentStore.Id;
-        vm.Users = users.Select(u => new StoreUsersViewModel.StoreUserViewModel()
+        vm.Users = users.Select(u => new StoreUsersViewModel.StoreUserViewModel
         {
             Email = u.Email,
+            Name = u.UserBlob.Name,
+            ImageUrl = u.UserBlob.ImageUrl,
             Id = u.Id,
             Role = u.StoreRole.Role
         }).ToList();