[App size reduction] Prune xcdatamodels and associated migrations from 2018-2023

[iamgabrielma]

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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]

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⚠️	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	pr15921-af7dc03
	Version	22.8
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	af7dc03
	Installation URL	1hf2fit1ked1g

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