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-protocol/schema/json/ServerRequest.json

@@ -722,21 +722,6 @@
         }
       ]
     },
-    "SkillRequestApprovalParams": {
-      "properties": {
-        "itemId": {
-          "type": "string"
-        },
-        "skillName": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "itemId",
-        "skillName"
-      ],
-      "type": "object"
-    },
     "ThreadId": {
       "type": "string"
     },
@@ -898,30 +883,6 @@
       "title": "Item/tool/requestUserInputRequest",
       "type": "object"
     },
-    {
-      "properties": {
-        "id": {
-          "$ref": "#/definitions/RequestId"
-        },
-        "method": {
-          "enum": [
-            "skill/requestApproval"
-          ],
-          "title": "Skill/requestApprovalRequestMethod",
-          "type": "string"
-        },
-        "params": {
-          "$ref": "#/definitions/SkillRequestApprovalParams"
-        }
-      },
-      "required": [
-        "id",
-        "method",
-        "params"
-      ],
-      "title": "Skill/requestApprovalRequest",
-      "type": "object"
-    },
     {
       "description": "Execute a dynamic tool call on the client.",
       "properties": {