RE:
Actually, I found it helpful that the DataflowStagingLakehouse and DataflowstagingWarehouse were still visible in the onelake data hub. because I created a DFGen2 in a workspace with GIT and Deployment pipelines enabled. DFG2 is not yet supported in Github and even worse: If you create a DFgen2, deployment via deployment pipelines is not possible anymore. However, after deleting the DFGEN2 I still had those to Dataflowgen2Lakehouse and warehouse artifact that I couldn't delete via GIT (because they were dependent on each other) and They were hidden in the workspace so I couldn't delete them manually :( In the end, I deleted them via the Onelake datahub and that solved the problem for me....Still agree with this idea. however then GIT integration and deployment pipelines should also work