Revert "Add skill approval event/response (#12633)" (#12811)

This reverts commit https://github.com/openai/codex/pull/12633. We no
longer need this PR, because we favor sending normal exec command
approval server request with `additional_permissions` of skill
permissions instead

codex-rs/app-server-test-client/src/lib.rs

@@ -57,9 +57,6 @@ use codex_app_server_protocol::SendUserMessageParams;
 use codex_app_server_protocol::SendUserMessageResponse;
 use codex_app_server_protocol::ServerNotification;
 use codex_app_server_protocol::ServerRequest;
-use codex_app_server_protocol::SkillApprovalDecision;
-use codex_app_server_protocol::SkillRequestApprovalParams;
-use codex_app_server_protocol::SkillRequestApprovalResponse;
 use codex_app_server_protocol::ThreadItem;
 use codex_app_server_protocol::ThreadListParams;
 use codex_app_server_protocol::ThreadListResponse;
@@ -1511,9 +1508,6 @@ impl CodexClient {
             ServerRequest::FileChangeRequestApproval { request_id, params } => {
                 self.approve_file_change_request(request_id, params)?;
             }
-            ServerRequest::SkillRequestApproval { request_id, params } => {
-                self.approve_skill_request(request_id, params)?;
-            }
             other => {
                 bail!("received unsupported server request: {other:?}");
             }
@@ -1593,22 +1587,6 @@ impl CodexClient {
         Ok(())
     }
 
-    fn approve_skill_request(
-        &mut self,
-        request_id: RequestId,
-        params: SkillRequestApprovalParams,
-    ) -> Result<()> {
-        println!(
-            "\n< skill approval requested for item {}, skill {}",
-            params.item_id, params.skill_name
-        );
-        let response = SkillRequestApprovalResponse {
-            decision: SkillApprovalDecision::Approve,
-        };
-        self.send_server_request_response(request_id, &response)?;
-        Ok(())
-    }
-
     fn approve_file_change_request(
         &mut self,
         request_id: RequestId,