Update review-protocol dependency and affected tests

[dayeon5470]

Background

Changes introduced after review-protocol 0.19.0 renamed AgentInfo.app_name to agent_name and made unary_request private, requiring updates to the Roxy test code.

Proposed Changes

• Update the review-protocol dependency to rev = "b0eae25"
• Replace app_name with agent_name in two tests
• Update one Linux-only test to avoid relying on the private unary_request API