MenuItem to trigger `action` event

[matsbryntse]

Could you please consider to add in MenuItem also:

item.trigger('action', itemEvent);

So we can have one handler definition in namedItems instead of 2, so it can be re-used for both buttons and menu items:

    namedItems: {
                removeRow: {
                    text: 'Remove row',
                    onItem: 'ctrl.onRemoveRowClick',
                    onAction: 'ctrl.onRemoveRowClick',
                },
            },

=>

    namedItems: {
                removeRow: {
                    text: 'Remove row',
                    onAction: 'ctrl.onRemoveRowClick',
                },
            },

Originally posted by @vadimpopa in https://github.com/bryntum/support/issues/8266#issuecomment-1925414302