check authdata for different format (#17577)

* check authdata for different format

* add mocks, fix lint

* rename function

* update auth-data with new format

* update assert

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/gitlab/gitlab.go

@@ -109,3 +109,7 @@ func (m *GitLabProvider) GetSSOSettings(config *model.Config, service string) (*
 func (m *GitLabProvider) GetUserFromIdToken(idToken string) (*model.User, error) {
 	return nil, nil
 }
+
+func (m *GitLabProvider) IsSameUser(dbUser, oauthUser *model.User) bool {
+	return dbUser.AuthData == oauthUser.AuthData
+}