feat: [AppsChat] Addition of QuoteType enum, QuotedMessageSnapshot & ForwardMetadata in the QuotedMessageMetadata proto

* feat: Addition of QuoteType enum, QuotedMessageSnapshot & ForwardMetadata in the QuotedMessageMetadata proto

PiperOrigin-RevId: 864426372

Source-Link: googleapis/googleapis@66d47db

Source-Link: googleapis/googleapis-gen@4cfb0bd
Copy-Tag: eyJwIjoiQXBwc0NoYXQvLk93bEJvdC55YW1sIiwiaCI6IjRjZmIwYmRmNjY5ZDM5YjkzZjRlYjczZTg5OWQyZDRkNTVkZjIxZTEifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

docs: update reference documentation for `SelectionInput.DROPDOWN` to include dynamic data sources and autosuggestion
docs: update copyright to 2026

PiperOrigin-RevId: 864941572

Source-Link: googleapis/googleapis@2ca9449

Source-Link: googleapis/googleapis-gen@2801688
Copy-Tag: eyJwIjoiQXBwc0NoYXQvLk93bEJvdC55YW1sIiwiaCI6IjI4MDE2ODg2ZmVkM2EyNGRmZTExNjIyNTMyYTIwMjdhM2Q3OTExNzcifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]