Adding 'MessageHasBeenDeleted' hook to plugins (#22476)

* Adding 'MessageHasBeenDeleted' hook to plugins

* Remove debug logs

* Add unit test

* Bumping the required version

* Fix CI problems

* Increasing the minimum version

* go fmt

---------

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/plugin/product_hooks_generated.go

@@ -50,6 +50,10 @@ type MessageHasBeenUpdatedIFace interface {
 	MessageHasBeenUpdated(c *Context, newPost, oldPost *model.Post)
 }
 
+type MessageHasBeenDeletedIFace interface {
+	MessageHasBeenDeleted(c *Context, post *model.Post)
+}
+
 type ChannelHasBeenCreatedIFace interface {
 	ChannelHasBeenCreated(c *Context, channel *model.Channel)
 }
@@ -220,6 +224,15 @@ func NewAdapter(productHooks any) (*HooksAdapter, error) {
 		return nil, errors.New("hook has MessageHasBeenUpdated method but does not implement plugin.MessageHasBeenUpdated interface")
 	}
 
+	// Assessing the type of the productHooks if it individually implements MessageHasBeenDeleted interface.
+	tt = reflect.TypeOf((*MessageHasBeenDeletedIFace)(nil)).Elem()
+
+	if ft.Implements(tt) {
+		a.implemented[MessageHasBeenDeletedID] = struct{}{}
+	} else if _, ok := ft.MethodByName("MessageHasBeenDeleted"); ok {
+		return nil, errors.New("hook has MessageHasBeenDeleted method but does not implement plugin.MessageHasBeenDeleted interface")
+	}
+
 	// Assessing the type of the productHooks if it individually implements ChannelHasBeenCreated interface.
 	tt = reflect.TypeOf((*ChannelHasBeenCreatedIFace)(nil)).Elem()
 
@@ -475,6 +488,15 @@ func (a *HooksAdapter) MessageHasBeenUpdated(c *Context, newPost, oldPost *model
 
 }
 
+func (a *HooksAdapter) MessageHasBeenDeleted(c *Context, post *model.Post) {
+	if _, ok := a.implemented[MessageHasBeenDeletedID]; !ok {
+		panic("product hooks must implement MessageHasBeenDeleted")
+	}
+
+	a.productHooks.(MessageHasBeenDeletedIFace).MessageHasBeenDeleted(c, post)
+
+}
+
 func (a *HooksAdapter) ChannelHasBeenCreated(c *Context, channel *model.Channel) {
 	if _, ok := a.implemented[ChannelHasBeenCreatedID]; !ok {
 		panic("product hooks must implement ChannelHasBeenCreated")