* [Alerting]: forbid viewers for updating rules if viewers can edit
check for CanSave instead of CanEdit
* Clear ngalert tables when deleting the folder
* Apply suggestions from code review
* Log failure to check save permission
Co-authored-by: gotjosh <josue@grafana.com>
(cherry picked from commit 23939eab10)
Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>