[Woo POS][Barcodes] Analytics tracking for barcode scanning

[staskus]

WOOPRD-566
Android task: woocommerce/woocommerce-android#14177

Description

Add tracking for barcode scanning to match Android:

1. Extend pos_item_added_to_cart event:
   -item_type with loading and error values
   -source_type with a scanner value

• error with an error message in case of failed scan

2. Extend pos_item_removed_from_cart event:

• item_type with loading and error values

Steps to reproduce

Valid simple product

1. Scan a valid product
2. Confirm pos_item_added_to_cart is tracked with item_type: loading and source_type: scanner
3. When the product loads, confirm pos_item_added_to_cart is tracked with item_type: product, product_type: simple and source_type: scanner
4. Remove, confirm pos_item_removed_from_cart is tracked with the same attributes

Valid variation

1. Scan a valid variation
2. Confirm pos_item_added_to_cart is tracked with item_type: loading and source_type: scanner
3. When the product loads, confirm pos_item_added_to_cart is tracked with item_type: product, product_type: variation and source_type: scanner
4. Remove, confirm pos_item_removed_from_cart is tracked with the same attributes

Invalid

1. Scan an invalid barcode
2. Confirm pos_item_added_to_cart is tracked with item_type: loading and source_type: scanner
3. When the error appears, confirm pos_item_added_to_cart is tracked with item_type: error, source_type: scanner and error containing an error message
4. Remove, confirm pos_item_removed_from_cart is tracked with item_type: error, source: cart

Loading

1. Scan an invalid barcode
2. Confirm pos_item_added_to_cart is tracked with item_type: loading and source_type: scanner
3. Remove before loading has finished
4. Confirm pos_item_removed_from_cart is tracked with item_type: loading, source: cart

Testing information

Tested with iPad Air M2 18.3 Device

---

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

[dangermattic]

	1 Warning
⚠️	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.

Generated by 🚫 Danger

[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	30569
	Version	PR #15758
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	cbc63cd
	Installation URL	7fd24pncd24o0

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

[joshheald]

Works well, one suggestion for improvement by tracking the whole error.