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>

pkg/services/alerting/notifiers/googlechat.go

@@ -19,13 +19,6 @@ func init() {
 		Description: "Sends notifications to Google Hangouts Chat via webhooks based on the official JSON message format",
 		Factory:     newGoogleChatNotifier,
 		Heading:     "Google Hangouts Chat settings",
-		OptionsTemplate: `
-      <h3 class="page-heading">Google Hangouts Chat settings</h3>
-      <div class="gf-form max-width-30">
-        <span class="gf-form-label width-6">Url</span>
-        <input type="text" required class="gf-form-input max-width-30" ng-model="ctrl.model.settings.url" placeholder="Google Hangouts Chat incoming webhook url"></input>
-      </div>
-    `,
 		Options: []alerting.NotifierOption{
 			{
 				Label:        "Url",