Add cloud_region to PrivateLink response message

[shreyasj-livekit]

Summary

• Adds a cloud_region field (field 8) to the PrivateLink proto message in livekit_cloud_agent.proto.
• Regenerates the corresponding .pb.go and .twirp.go files.

Motivation

We already accept cloud_region on CreatePrivateLinkRequest (PR #1498) and store it in the DB. This PR makes it available on the response side so that downstream consumers — the livekit-cli private-link command and the web dashboard (livekit/web#3918) — can display which cloud provider region a private link is on.

Test plan

• mage proto runs clean
• Consumers (cloud-agents, livekit-cli) bump protocol and build successfully against this change

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