Chore: Remove bus from dashboard service (#46829)

* Move DeleteDashboard funtion into dashboards store service, remove bus and update tests

* Remove bus from folder service and update more tests

* Fix mock

pkg/services/dashboards/database/database_provisioning_test.go

@@ -120,7 +120,7 @@ func TestDashboardProvisioningTest(t *testing.T) {
 				OrgId: 1,
 			}
 
-			require.Nil(t, sqlStore.DeleteDashboard(context.Background(), deleteCmd))
+			require.Nil(t, dashboardStore.DeleteDashboard(context.Background(), deleteCmd))
 
 			data, err := dashboardStore.GetProvisionedDataByDashboardID(dash.Id)
 			require.Nil(t, err)