Jetpack Infinite Scroll: Add support for WooCommerce

[Misplon]

At Jetpack Infinite Scroll support for WooCommerce.

[gregpriday]

@braamgenis Do you remember your work on 0a8644d well enough to implement this enhancement? I've had a look but I'm not quite following the logic well enough to implement this without breaking our existing Jetpack infinite scroll for the different blog layouts.

[braamgenis]

@gregpriday Will take a look see. 👀