update to support disconnected environment

[TheOnlyWei]

This change is to support disconnected on-premises environments.

Related command

az connectedk8s

General Guidelines

• [X] Have you run azdev style <YOUR_EXT> locally? (pip install azdev required) NOTE: there are pre-existing style errors.
• [X] Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• [X] My extension version conforms to the Extension version schema

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.