Cleanup skills/remote/xxx endpoints. (#14977)

Remote skills/remote/xxx as they are not in used for now.

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -339,8 +339,6 @@ async fn run_codex_tool_session_inner(
                     | EventMsg::McpListToolsResponse(_)
                     | EventMsg::ListCustomPromptsResponse(_)
                     | EventMsg::ListSkillsResponse(_)
-                    | EventMsg::ListRemoteSkillsResponse(_)
-                    | EventMsg::RemoteSkillDownloaded(_)
                     | EventMsg::ExecCommandBegin(_)
                     | EventMsg::TerminalInteraction(_)
                     | EventMsg::ExecCommandOutputDelta(_)