[Tooling] Skip UI Tests if there are no relevant changes

[iangmaia]

Description

This PR depends on Automattic/a8c-ci-toolkit-buildkite-plugin#148.

This PR updates the UI Test jobs to use the result of the command pr_changed_files from a8c-ci-toolkit-buildkite-plugin to decide if tests should run or not.

Testing

• Test run changing a code file: https://buildkite.com/automattic/woocommerce-ios/builds/28529
• Revert the change in the code file, skipping Unit / UI Tests CI Jobs: https://buildkite.com/automattic/woocommerce-ios/builds/28553

[wpmobilebot]

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

	App Name	WooCommerce iOS
	Build Number	pr15086-8978d0a
	Version	21.8
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	8978d0a
	App Center Build	WooCommerce - Prototype Builds #13153

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

[AliSoftware]

🎗️ Reminder to revert the changes on this file before undrafting this PR and merging it, since those are only for temporary debugging purposes.

[iangmaia]

I updated the a8c toolkit plugin version, ran a couple of tests (see updated description) and reverted this temp change.

[coderabbitai]

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