Products Onboarding: Support template products

[Ecarrion]

Closes: #7949

Why

This PR makes sure that a template product can be used within the product form as it was manually populated by the merchant.

How

Instead of taking the long route and adding full auto-draft support to our product form module, I've taken a shortcut where after getting a template product, which has an auto-draft status, the app removes that product identity (id, name and status) so it's treated like a new product but with all the necessary content prefilled.

We can evaluate later if full auto-draft support is needed.

Demo

auto-draft-support.mov

Testing Steps

• On a store with less than 3 products, tap the add product button
• Select the "Template" option and a product type.
• See that you can modify, save or publish the template product.

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr8005-5e5cfe8 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[rachelmcr]

Nice idea! That shortcut makes a lot of sense for what we need right now. Looks good and tests well. 🚀