MM-13851 Added a UserWasCreated hook for server-side plugins (#10178)

plugin/plugintest/hooks.go

@@ -194,6 +194,11 @@ func (_m *Hooks) ServeHTTP(c *plugin.Context, w http.ResponseWriter, r *http.Req
 	_m.Called(c, w, r)
 }
 
+// UserHasBeenCreated provides a mock function with given fields: c, user
+func (_m *Hooks) UserHasBeenCreated(c *plugin.Context, user *model.User) {
+	_m.Called(c, user)
+}
+
 // UserHasJoinedChannel provides a mock function with given fields: c, channelMember, actor
 func (_m *Hooks) UserHasJoinedChannel(c *plugin.Context, channelMember *model.ChannelMember, actor *model.User) {
 	_m.Called(c, channelMember, actor)