* break out new and edit
* changed model to match new model in backend
* AlertingNG: API modifications (#30683)
* Fix API consistency
* Change eval alert definition to POST request
* Fix eval endpoint to accept custom now parameter
* Change JSON input property for create/update endpoints
* model adjustments
* set mixed datasource, fix put url
* update snapshots
* remove edit and add landing page
* remove snapshot tests ans snapshots
* wrap linkbutton in array
Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>
Co-authored-by: Sofia Papagiannaki <sofia@grafana.com>