My Jetpack: Fire Tracks events for click on product add link

[oskosk]

Adds tracking for clicks on add links for product cards.

Changes proposed in this Pull Request:

• Introduces function addHandler that will call the passed prop onAdd after firing Tracks event.

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Introduces 1 new event:

• jetpack_myjetpack_product_card_add_click fired when the user clicks on a product card add link

Testing instructions:

• Checkout this branch on a site with Jetpack connected the Backup plugin active, and the JETPACK_ENABLE_MY_JETPACK constant set to true.
• Open the browser and visit the site's wp-admin.
• Open the developer console, execute the following code: localStorage.debug='dops:analyitics*
• Go to "Jetpack -> My Jetpack", Confirm that the developer console displays the events jetpack_myjetpack_product_card_add_click ` when clicking such link from the CRM product card for example.

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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[retrofox]

LGTM

[oskosk]

Gracia!