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>

web/oauth_test.go

@@ -618,6 +618,10 @@ func (m *MattermostTestProvider) GetUserFromIdToken(token string) (*model.User,
 	return nil, nil
 }
 
+func (m *MattermostTestProvider) IsSameUser(dbUser, oauthUser *model.User) bool {
+	return dbUser.AuthData == oauthUser.AuthData
+}
+
 func GenerateTestAppName() string {
 	return "fakeoauthapp" + model.NewRandomString(10)
 }