[Daily Business] Upgrade our pipelines to use Kubernetes 1.29

[zhoujing2022]

Description We are going to upgrade Kyma to support K8s version 1.28. This requires an updated of all existing pipelines and preview-jobs to use 1.29 (respectively 1.30 for preview jobs). (Please complete this task before 20.May.2024)

Tasks

• [ ] Prow jobs are based on k8s 1.29 - see example PR
  • [ ] kyma-upgrade-gardener-kyma2-minor-versions job should be still using the currently used k8s version and not be updated
  • [ ] Existing release jobs should also not be updated to use the new K8s version
• [ ] Default version for kubectl is 1.29 (Docu, Prow)
• [ ] Configure preview job to verify if Kyma is compatible with k8s1.30 (next k8s version - see example PR)
  • [ ] create tickets (and link them) for other teams if the pipeline gets red (ping release-manager and provide him the issue-link)

Previous upgrade: https://github.com/kyma-project/test-infra/issues/9807

Relates to https://github.com/kyma-project/kyma/issues/18669