Add @fire and @event documentation for EnableNewProductSyncButton

[puntope]

We missed adding the JSDOCS for the event in EnableNewProductSyncButton

It should be something like:

/**
 * @event  gla_enable_product_sync_click
 * 
 * @property {string} context Indicates where this event happened
 */

and

/**
 * @fires gla_enable_product_sync_click with `{ context: "banner"}`
 */

• Check also more places where events are not being documented.

Is your feature request related to a problem?

Lack of documentation for the added events.

How to reproduce the problem

Doc-related problem. Not reproducible in the plugin.

Describe the solution you'd like

Documentation for the added events as explained before.