[Woo POS] Use SF symbols for icons, not images

[joshheald]

Description

I've noticed some icons we're using are added as images, but could be used as SF symbols – e.g.

arrow.uturn.backward for the arrow in on the New Transaction button:

rectangle.portrait.and.arrow.forward for the Exit POS button

Same for dismissing products banner, getting support, removing an item from the cart. Check the images in the POS folder for any icon-like images, remove and replace at the callsites.

Using SF symbols removes code, and makes sure the images are appropriate for both LTR and RTL locales.

[dangermattic]

Thanks for reporting! 👍

[iamgabrielma]

The SFSymbol for the CartView's back button has been handled here: #13631