Revert "Updating permissions for agentic workflows" (#39073)

Reverts #39071

same error as last time `400 400 checking server-to-server token: bad
request: GitHub App Server-To-Server Tokens are not supported for this
endpoint`

Author: xirzec

.github/workflows/agent-observability.lock.yml

@@ -28,7 +28,6 @@ permissions:
   actions: read
   pull-requests: read
   issues: read
-  copilot-requests: write
 # DataOps: collect every metric in a deterministic, authenticated shell
 # step (GH_TOKEN → 5000 req/hr, runs outside the agent sandbox). The
 # agent never makes API calls; it only reads /tmp/gh-aw/agent/*.json.