[App size reduction] Remove domain purchase remaining logic

[iamgabrielma]

Continuation of #15754 and WOOMOB-534

Description

In the previous PR we removed the unused code around domain purchases in the WooCommerce target, in this PR we remove the remaining code in Yosemite and Networking.

Testing information

• CI should pass
• From my understanding of this feature, we should still see no Domains row under Menu tab > Settings, on a WPCom test store without a custom domain, and no ability to purchase a domain through the app.

[dangermattic]

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

	1 Message
📖	This PR contains changes to Tracks-related logic. Please ensure (author and reviewer) the following are completed: The tracks events must be validated in the Tracks system. Verify the internal Tracks spreadsheet has also been updated. Please consider registering any new events. The PR must be assigned the category: tracks label.

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	30611
	Version	PR #15787
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	bd06297
	Installation URL	2dbk6qi0u8b4o

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

[iamgabrielma]

Adding you as a reviewer for now to trigger CI @itsmeichigo , as I have troubles building the project with the latests infra changes to confirm all is good. No need to review the changes yet.

[iamgabrielma]

This is ready for review, I'm not acquainted with the feature so please let me know if there's something off 🙇

Most likely we can remove PaymentStore/Action as well, since we don't sell plans neither, but I've kept this outside of the scope for this one.

[itsmeichigo]

Thanks for cleaning this up!