BackendSrv: Cancellable requests & Observable all the way (#25746)

* BackendSrv: Observable all the way POC

* starting to unify code paths

* tests pass

* Unified error handling

* Single request path and error handling

* Fixed ts issue

* another ts issu

* Added back old requestId cancellation

* Slow progress trying to grasp the full picture of cancellation

* Updates

* refactoring

* Remove a bunch of stuff from backendSrv

* Removed another function

* Do not show error alerts for data queries

* Muu

* Updated comment

* fixed ts issue

* unify request options type

* Made query inspector subscribe to backendSrv stream instead of legacy app events

* Add back support for err.isHandled to limit scope

* never show success alerts

* Updated tests

* Fixing tests

* Minor weak

* Improved logic for the showErrorAlert and showSuccessAlert boolean flags, now they work more logically

* Fix issue

public/app/features/dashboard/components/SaveDashboard/useDashboardSave.tsx

@@ -7,11 +7,11 @@ import { CoreEvents, StoreState } from 'app/types';
 import appEvents from 'app/core/app_events';
 import { updateLocation } from 'app/core/reducers/location';
 import { DashboardModel } from 'app/features/dashboard/state';
-import { getBackendSrv } from 'app/core/services/backend_srv';
+import { saveDashboard as saveDashboardApiCall } from 'app/features/manage-dashboards/state/actions';
 
 const saveDashboard = async (saveModel: any, options: SaveDashboardOptions, dashboard: DashboardModel) => {
   const folderId = options.folderId >= 0 ? options.folderId : dashboard.meta.folderId || saveModel.folderId;
-  return await getBackendSrv().saveDashboard(saveModel, { ...options, folderId });
+  return await saveDashboardApiCall({ ...options, folderId, dashboard: saveModel });
 };
 
 export const useDashboardSave = (dashboard: DashboardModel) => {