[Woo POS][App Listings] ASC promo screenshots

[iamgabrielma]

Closes WOOMOB-1644

Description

This PR handles creating the new POS promotional screenshots and submitting them to the App Store through our existing fastlane automation.

Changes

• Added backgrounds and frames for landscape images
• Updated fastfile to include the new mapping app_store_screenshot -> promo_screenshot
• Updated screenshots.json to include a new landscape device, mostly mapping the existing portrait one. These are mounted programmatically by pixel/pixel-offset, but there is no references anywhere, so was a bit of iteration to make them fit adequately:

• iPad

  • Runs UI POS screenshot tests on iPads only
  • Intersects the new screenshots in the existing ones (mostly a dependency from UI tests having to be run in a given order)
  • Mounts background/frame/screenshot/text for the promotional screenshot

• iPhones

  • Moves existing 1-5 iPhone screenshots to default folder
  • Updates which text to image mapping to use for 4th and 5th screenshots, due the new inclusion of iPad screenshots since we don't have the same number of them in each device now and would map the wrong text.

Test Steps

• Run WooCommerceScreenshots.testScreenshots() both in iPad and iPhone as your run destination, they should pass (some UI tests are a bit flaky, but on a second run they should normally pass correctly)
• The screenshot output cannot be tested locally, but we can find the artifacts from the CI job in ...

Screenshots

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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.

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📲 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	pr16405-fff2bb7
	Version	23.8
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	fff2bb7
	Installation URL	61hoouttqke10

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