MM-53924 - Implement push notifications plugin hook and plugin api method (#24350)

* Revert "MM-52804 - Implement SendPushNotification plugin api method (#24273)"

This reverts commit 8418eefb75.

* Revert "MM-53924 - Implement NotificationWillBePushed plugin hook (#24263)"

This reverts commit f13a531bca.

* implement NotificationWillBePushed plugin hook

* implement SendPushNotification plugin api method

* move where we're setting post and channel type

* fix comment

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/plugin/hooks_timer_layer_generated.go

@@ -219,9 +219,9 @@ func (hooks *hooksTimerLayer) ConfigurationWillBeSaved(newCfg *model.Config) (*m
 	return _returnsA, _returnsB
 }
 
-func (hooks *hooksTimerLayer) NotificationWillBePushed(pushNotification *model.PluginPushNotification) (cancel bool) {
+func (hooks *hooksTimerLayer) NotificationWillBePushed(pushNotification *model.PushNotification, userID string) (*model.PushNotification, string) {
 	startTime := timePkg.Now()
-	_returnsA := hooks.hooksImpl.NotificationWillBePushed(pushNotification)
+	_returnsA, _returnsB := hooks.hooksImpl.NotificationWillBePushed(pushNotification, userID)
 	hooks.recordTime(startTime, "NotificationWillBePushed", true)
-	return _returnsA
+	return _returnsA, _returnsB
 }