[Woo POS][Barcodes] Separate barcode and scanner info screens

[joshheald]

Closes: WOOMOB-696
Closes: WOOMOB-806
Merge after #15904

Description

This PR splits "how to set up your products" from general barcode scanner info.

The Other flow becomes 2 steps, and the specific reader flows can show "how to set up your products" at the end.

I've also tweaked all the sizes and layouts to more closely match designs.

Steps to reproduce

1. Launch the app, open POS
2. Tap ... > Barcode scanning
3. Try the Other flow – observe that it's two screens with the information split between them.
4. Try the Star flow – observe that the final optional step is the product setup information.

Screenshots

info.screens.split.up.mp4

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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.

[dangermattic]

	1 Warning
⚠️	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr15905-a71501d
	Version	22.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	a71501d
	Installation URL	3j7nvhl1kifa0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[staskus]

I don't see why we cannot continue using .next instead of .optionalNext here. I'll revert to .next for simplicity and re-implement in case I understand its usefulness.