Fix az janitor query

[cpinjani]

What does this PR do?

The current query lists Node resource groups along with parent AKS resource groups. eg. MC_auto-aks-hp-ci-hfzlv_auto-aks-hp-ci-hfzlv_centralindia This change lists only AKS resource groups since Node resource groups get auto-deleted along with them.

• [x] GitHub Actions: Unfixed run: https://github.com/rancher/hosted-providers-e2e/actions/runs/11287010203/job/31392235896#step:3:13 Fixed run: https://github.com/rancher/hosted-providers-e2e/actions/runs/11287948455/job/31394785232