Environment without Kubeflow

[SebastienDorgan]

Is your feature request related to a problem? Please describe.
I have created an environment with Airflow installed, I do not plan to use Kubeflow, is there a way to not install Kubeflow Pipeline editor and Kubeflow configuration extension?

Describe the solution you'd like
Maybe it could be useful to create 3 distincts pipeline editor extensions package
https://elyra.readthedocs.io/en/v2.1.0/getting_started/installation.html#pip

• pip install --upgrade elyra-airflow-pipeline-editor-extension && jupyter lab build
• pip install --upgrade elyra-generic-pipeline-editor-extension && jupyter lab build
• pip install --upgrade elyra-kubeflow-pipeline-editor-extension && jupyter lab build

Describe alternatives you've considered
Adding the possibility to deactivate the extension from Jupyter lab configuration

[ptitzler]

Related PR #2259

[lresende]

Duplicate of #2136