fix(user fields): missing creationDate in details (#9250)

# Which Problems Are Solved

The `creationDate` property on user search V2 endpoint was missing

# How the Problems Are Solved

Added property in v2 `object.proto` and in the function creating the
details on each call

# Additional Changes
- none
# Additional Context
closes #8552

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

internal/api/grpc/user/v2/query.go

@@ -21,6 +21,7 @@ func (s *Server) GetUserByID(ctx context.Context, req *user.GetUserByIDRequest)
 	return &user.GetUserByIDResponse{
 		Details: object.DomainToDetailsPb(&domain.ObjectDetails{
 			Sequence:      resp.Sequence,
+			CreationDate:  resp.CreationDate,
 			EventDate:     resp.ChangeDate,
 			ResourceOwner: resp.ResourceOwner,
 		}),
@@ -58,6 +59,7 @@ func userToPb(userQ *query.User, assetPrefix string) *user.User {
 			Sequence:      userQ.Sequence,
 			EventDate:     userQ.ChangeDate,
 			ResourceOwner: userQ.ResourceOwner,
+			CreationDate:  userQ.CreationDate,
 		}),
 		State:              userStateToPb(userQ.State),
 		Username:           userQ.Username,