Migration: Edit notification channel (#25980)

* implement edit page

* connectWithCleanup

* remove angular related code

* use loadingindicator

* use the correct loading component

* handle secureFields

* fixed implementation of secure fields

* Keep secureFields after rerendering the form

* CollapsableSection and Page refactor

* use checkbox instead of switch

* fix comment

* add cursor to section

* Fixed issues after PR review

* Fix issue with some settings being undefined

* new reducer and start with test

* algorithm to migrate secure fields

* UX: Minor UI Tweaks

* Added field around checkboxes, and missing required field

* fixed test

* tests for util

* minor tweaks and changes

* define as records

* fix typ error

* forward invalid to textarea and inputcontrol

* merge formdata and redux data in test

* fix issue with creating channel

* do not figure out securefields in migration

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

public/app/features/all.ts

@@ -5,7 +5,6 @@ import './dashboard';
 import './playlist/all';
 import './panel/all';
 import './admin';
-import './alerting/NotificationsEditCtrl';
 import './manage-dashboards';
 import './profile/all';
 import './datasources/settings/HttpSettingsCtrl';