chore(coderd/database/dbauthz): migrate the Notifications and Prebuilds tests to use mocked DB (coder#19302)

Related to coder/internal#869

---------

Co-authored-by: Steven Masley <stevenmasley@gmail.com>

Author: hugodutka

coderd/database/dbauthz/dbauthz.go

@@ -4584,6 +4584,7 @@ func (q *querier) UpdatePresetPrebuildStatus(ctx context.Context, arg database.U
 		return err
 	}
 
+	// TODO: This does not check the acl list on the template. Should it?
 	object := rbac.ResourceTemplate.
 		WithID(preset.TemplateID.UUID).
 		InOrg(preset.OrganizationID)