Migration: Save dashboard modals (#22395)

* Add mechanism for imperatively showing modals

* Migration work in progress

* Reorganise save modal components

* use app events emmiter instead of root scope one

* Add center alignment to layoout component

* Make save buttons wotk

* Prettier

* Remove save dashboard logic  from dashboard srv

* Remove unused code

* Dont show error notifications

* Save modal when dashboard is overwritten

* For tweaks

* Folder picker tweaks

* Save dashboard tweaks

* Copy provisioned dashboard to clipboard

* Enable saving dashboard json to file

* Use SaveDashboardAsButton

* Review

* Align buttons in dashboard settings

* Migrate SaveDashboardAs tests

* TS fixes

* SaveDashboardForm tests migrated

* Fixe some failing tests

* Fix folder picker tests

* Fix HistoryListCtrl tests

* Remove old import

* Enable fixed positioning for folder picker select menu

* Modal: show react modals with appEvents

* Open react modals using event

* Move save dashboard modals to dashboard feature

* Make e2e pass

* Update public/app/features/dashboard/components/SaveDashboard/SaveDashboardButton.tsx

* Hacking old vs new buttons to make all the things look like it's old good Grafana ;)

Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>

packages/grafana-e2e/src/pages/saveDashboardModal.ts

@@ -4,5 +4,7 @@ export const SaveDashboardModal = pageFactory({
   url: '',
   selectors: {
     save: 'Dashboard settings Save Dashboard Modal Save button',
+    saveVariables: 'Dashboard settings Save Dashboard Modal Save variables checkbox',
+    saveTimerange: 'Dashboard settings Save Dashboard Modal Save timerange checkbox',
   },
 });