[ci] Rename GRAPHITE_TOKEN to GRAPHITE_CI_OPTIMIZER_TOKEN (#94166)

This secret got renamed when we issued a new one. Discussion:
https://vercel.slack.com/archives/C01LN7C5QR5/p1777662825523989

<img width="670" height="226" alt="Screenshot 2026-05-27 at 12 12 42 PM"
src="https://github.com/user-attachments/assets/65c3d125-a493-4b02-b461-3a5292604ad6"
/>


<img width="446" height="167" alt="Screenshot 2026-05-27 at 12 11 42 PM"
src="https://github.com/user-attachments/assets/24e226fb-5818-45de-9883-e8fd7d0d26c6"
/>

.github/workflows/graphite_ci_optimizer.yml

@@ -18,7 +18,7 @@ on:
         description: "'true' if expensive CI checks should be skipped, 'false' otherwise."
         value: ${{ jobs.optimize-ci.outputs.skip }}
     secrets:
-      GRAPHITE_TOKEN:
+      GRAPHITE_CI_OPTIMIZER_TOKEN:
         description: 'The Graphite CI optimization secret'
         # secrets are not available in forks, check-skip will just fail-open with a warning
         required: false
@@ -46,13 +46,13 @@ jobs:
         continue-on-error: true
         uses: withgraphite/graphite-ci-action@ee395f3a78254c006d11339669c6cabddf196f72 # main
         with:
-          graphite_token: ${{ secrets.GRAPHITE_TOKEN }}
+          graphite_token: ${{ secrets.GRAPHITE_CI_OPTIMIZER_TOKEN }}
       - name: Debug Output
         run: |
           echo 'github.event_name: ${{ github.event_name }}'
-          echo "secrets.GRAPHITE_TOKEN != '': ${GRAPHITE_TOKEN}"
+          echo "secrets.GRAPHITE_CI_OPTIMIZER_TOKEN != '': ${GRAPHITE_CI_OPTIMIZER_TOKEN_NON_EMPTY}"
           echo 'env.HAS_BYPASS_LABEL: ${{ env.HAS_BYPASS_LABEL }}'
           echo 'steps.check-skip.outputs.skip: ${{ steps.check-skip.outputs.skip }}'
 
         env:
-          GRAPHITE_TOKEN: ${{ secrets.GRAPHITE_TOKEN != '' }}
+          GRAPHITE_CI_OPTIMIZER_TOKEN_NON_EMPTY: ${{ secrets.GRAPHITE_CI_OPTIMIZER_TOKEN != '' }}