New feature flag productCreationAIv2M3

[pmusolino]

Part of #13118

Description

Added just a new feature flag to start the implementation of Product Creation with AI: v2 - Milestone 3.

Testing

Just CI

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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.

[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	pr13269-9b794b2
	Version	19.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	9b794b2
	App Center Build	WooCommerce - Prototype Builds #9928

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