fix summary if deletion fails

Signed-off-by: Mete Fatih Cırıt <mfc@autoware.org>

Author: xmfcx

.github/workflows/keep-build-cache-small.yaml

@@ -98,7 +98,7 @@ jobs:
             SUMMARY+="- **Threshold**: ${{ env.CACHE_THRESHOLD_GB }} GB\n"
 
             if [[ "${{ steps.check_threshold.outputs.status }}" == "exceeded" ]]; then
-              if [[ "${{ steps.verify_deletion.outputs.status }}" == "failed" ]]; then
+              if [[ "${{ steps.verify_deletion.outputs.status }}" != "success" ]]; then
                 SUMMARY+="❌ **Cache size exceeded, but deletion failed!**\n"
               else
                 SUMMARY+="🗑️✅ **Cache size exceeded. Image deleted successfully!**\n"