Zombienet: add polkadot-debug image publish as needs for cumulus tests (#2493)
Add `build-push-image-polkadot-debug` job to needs since we changed to use the polkadot-debug image from the current branch for cumulus test and we need to be sure that the image is ready. Fix issues like https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/4481059 cc: @bkchr Co-authored-by: Bastian Köcher <[email protected]>