UID2-6837: Replace GHCR_PAT with GITHUB_TOKEN in E2E workflow

The GHCR_PAT secret was deleted. GITHUB_TOKEN is automatically available
and the job already has packages: read permission, so no additional
configuration is needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: BehnamMozafari

.github/workflows/shared-run-e2e-tests.yaml

@@ -115,7 +115,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GHCR_PAT }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Checkout full history
         uses: actions/checkout@v4