[Woo POS] Use development assets for previews in Xcode

[jaclync]

Ref: #14782 (comment)

Let's try using development assets for previews in Xcode, so that we can have a richer set of previews data.

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.

[iamgabrielma]

I cannot see which automation has triggered the self-assignment & closure of this issue. Perhaps something from Linear? I'll reopen it 🤔 (edit: I've named one of my branches with the woomob identifier of this issue, so it auto-closed when merged, fixed).