[Product Global Unique Identifier] UI in the Product Inventory screen

[toupper]

Closes: #12960

Description

With this PR we implement the UI element (Edit View) for the Product Global Unique Identifier in the Inventory Settings for Products.

Steps to reproduce

1. Go to the Products tab
2. Tap on Any product
3. Tap on the Inventory row
4. See that we show the GTIN, UPC, EAN, ISBN field

Testing information

See steps above

The tests that have been performed

See steps above

Images/gif

• [X] I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• [X] The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• [X] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [X] Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[dangermattic]

	1 Warning
:warning:	This PR is assigned to the milestone 21.2. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

Generated by :no_entry_sign: Danger

[wpmobilebot]

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

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	5c83728cd84c52842d5b6125a6dc0e2434370a68
	Direct Download	woocommerce-wear-prototype-build-pr12962-5c83728.apk

[wpmobilebot]

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

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	5c83728cd84c52842d5b6125a6dc0e2434370a68
	Direct Download	woocommerce-prototype-build-pr12962-5c83728.apk