Add test notification tool (#28334)

* Add test notification tool

* Add frontend styles

* Remove option from admin view

* Refactor create post and add translations

* Fix several CI errors

* Fix API and frontend snapshots

* Refactor trailing and leading icon on buttons

* Add different button states

* i18n-extract

* Fix wrong text

* Add tests

* Fix wrong string

* Fix test

* feat: E2E send test notifications (#28371)

* Refactor send desktop notification

* Address rest of the feedback

* Fix tests

* Add correct link

* Fix test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>

server/channels/app/notification_push_test.go

@@ -1103,6 +1103,39 @@ func TestSendPushNotifications(t *testing.T) {
 	})
 }
 
+func TestShouldSendPushNotifications(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+	t.Run("should return true if forced", func(t *testing.T) {
+		user := &model.User{Id: model.NewId(), Email: "unit@test.com", NotifyProps: make(map[string]string)}
+		user.NotifyProps[model.PushNotifyProp] = model.UserNotifyNone
+
+		post := &model.Post{UserId: user.Id, ChannelId: model.NewId()}
+		post.AddProp(model.PostPropsForceNotification, model.NewId())
+
+		channelNotifyProps := map[string]string{model.PushNotifyProp: model.ChannelNotifyNone, model.MarkUnreadNotifyProp: model.ChannelMarkUnreadMention}
+
+		status := &model.Status{UserId: user.Id, Status: model.StatusOnline, Manual: false, LastActivityAt: model.GetMillis(), ActiveChannel: post.ChannelId}
+
+		result := th.App.ShouldSendPushNotification(user, channelNotifyProps, false, status, post, false)
+		assert.True(t, result)
+	})
+
+	t.Run("should return false if force undefined", func(t *testing.T) {
+		user := &model.User{Id: model.NewId(), Email: "unit@test.com", NotifyProps: make(map[string]string)}
+		user.NotifyProps[model.PushNotifyProp] = model.UserNotifyNone
+
+		post := &model.Post{UserId: user.Id, ChannelId: model.NewId()}
+
+		channelNotifyProps := map[string]string{model.PushNotifyProp: model.ChannelNotifyNone, model.MarkUnreadNotifyProp: model.ChannelMarkUnreadMention}
+
+		status := &model.Status{UserId: user.Id, Status: model.StatusOnline, Manual: false, LastActivityAt: model.GetMillis(), ActiveChannel: post.ChannelId}
+
+		result := th.App.ShouldSendPushNotification(user, channelNotifyProps, false, status, post, false)
+		assert.False(t, result)
+	})
+}
+
 // testPushNotificationHandler is an HTTP handler to record push notifications
 // being sent from the client.
 // It records the number of requests sent to it, and stores all the requests