fix(ci): remove --src-no-creds from skopeo sync to fix timeout

[shubham-sumo]

Summary

The sync-repository.sh script was failing with timeout errors during image syncing. The root cause is the --src-no-creds flag passed to skopeo sync, which forces unauthenticated access to source registries. Many public registries (e.g., Docker Hub, ECR Public) aggressively rate-limit anonymous pulls, causing repeated retries and eventual timeouts.

• Remove the --src-no-creds flag so skopeo can use available credentials from the Docker config mounted at /tmp/auth.json
• Authenticated pulls have significantly higher rate limits, avoiding the timeout failures

Test plan

• Verify the sync-repositories CI workflow completes successfully without timeout errors
• Confirm images are synced correctly to the destination registry

Sample Run: https://github.com/SumoLogic/sumologic-kubernetes-collection/actions/runs/25100478181