[Tooling] Fix outdated changelogs removal logic

[iangmaia]

Adding back the fastlane/metadata/*/en-US/changelogs/default.txt files and fixing the Fastlane logic that tries to remove instead of keeping them.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 19.2 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 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	a348d48
	Direct Download	woocommerce-wear-prototype-build-pr11780-a348d48.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	a348d48
	Direct Download	woocommerce-prototype-build-pr11780-a348d48.apk