Allow edits of entire Slack / MS Teams message including e.g. buttons and not just the text

### Discussed in https://github.com/grafana/grafana/discussions/67615 <div type='discussions-op-text'> ^{Originally posted by **blackswan1** May 2, 2023} In some cases, due to security restrictions, it's not possible to access the Grafana Alert Link supplied with the Alert message. e.g. MS-Teams WebHook. Hence the Button/Link is inoperable. It would be a big plus to get the choice whether the link shall be displayed/embedded in the alert message or not. From the community: https://community.grafana.com/t/remove-grafana-alert-url-from-ms-teams-alert-notification/85433 </div>