Revert "Adopt copilot-requests: write permission for agentic workflows" (#38947)

Reverts #38944

Not seemingly supported yet: 

> 400 400 checking server-to-server token: bad request: GitHub App
Server-To-Server Tokens are not supported for this endpoint

see
https://github.com/Azure/azure-sdk-for-js/actions/runs/27445813556/job/81130472451
for more

Author: xirzec

.github/workflows/archie.lock.yml

@@ -50,7 +50,6 @@ permissions:
   contents: read
   pull-requests: read
   actions: read
-  copilot-requests: write
 tools:
   github:
     toolsets: [context, repos, pull_requests, actions]