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/product_hooks_generated.go

@@ -119,7 +119,7 @@ type ConfigurationWillBeSavedIFace interface {
 }
 
 type NotificationWillBePushedIFace interface {
-	NotificationWillBePushed(pushNotification *model.PluginPushNotification) (cancel bool)
+	NotificationWillBePushed(pushNotification *model.PushNotification, userID string) (*model.PushNotification, string)
 }
 
 type HooksAdapter struct {
@@ -615,11 +615,11 @@ func (a *HooksAdapter) ConfigurationWillBeSaved(newCfg *model.Config) (*model.Co
 
 }
 
-func (a *HooksAdapter) NotificationWillBePushed(pushNotification *model.PluginPushNotification) (cancel bool) {
+func (a *HooksAdapter) NotificationWillBePushed(pushNotification *model.PushNotification, userID string) (*model.PushNotification, string) {
 	if _, ok := a.implemented[NotificationWillBePushedID]; !ok {
 		panic("product hooks must implement NotificationWillBePushed")
 	}
 
-	return a.productHooks.(NotificationWillBePushedIFace).NotificationWillBePushed(pushNotification)
+	return a.productHooks.(NotificationWillBePushedIFace).NotificationWillBePushed(pushNotification, userID)
 
 }