Update to new agent schema (#35578)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/acp_thread/Cargo.toml

@@ -17,7 +17,6 @@ test-support = ["gpui/test-support", "project/test-support"]
 
 [dependencies]
 agent-client-protocol.workspace = true
-agentic-coding-protocol.workspace = true
 anyhow.workspace = true
 assistant_tool.workspace = true
 buffer_diff.workspace = true
@@ -37,7 +36,6 @@ util.workspace = true
 workspace-hack.workspace = true
 
 [dev-dependencies]
-async-pipe.workspace = true
 env_logger.workspace = true
 gpui = { workspace = true, "features" = ["test-support"] }
 indoc.workspace = true