feat: a new optional field video_links is added to the .google.shopping.merchant.products.v1.ProductAttributes message (#33880)

* feat: a new optional field `video_links` is added to the `.google.shopping.merchant.products.v1.ProductAttributes` message
feat: a new optional field `annual_percentage_rate` is added to the `.google.shopping.merchant.products.v1.ProductInstallment` message
docs: A comment for field `gtins` in message `.google.shopping.merchant.products.v1.ProductAttributes` is changed
docs: A comment for field `mpn` in message `.google.shopping.merchant.products.v1.ProductAttributes` is changed

PiperOrigin-RevId: 902670459

Source-Link: googleapis/googleapis@4ae5f10

Source-Link: googleapis/googleapis-gen@b636728
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* 🦉 Updates from OwlBot post-processor

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