skip helm download if helm is already installed

[TheOnlyWei]

---

This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

General Guidelines

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

For new extensions:

• [ ] My extension description/summary conforms to the Extension Summary Guidelines.

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.

[azure-client-tools-bot-prd[bot]]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd[bot]]

Hi @TheOnlyWei, Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions[bot]]

For more info about extension versioning, please refer to Extension version schema

[yanzhudd]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 2 pipeline(s).

[azclibot]

[Release] Update index.json for extension [ connectedk8s ] : https://dev.azure.com/azclitools/release/_build/results?buildId=160330&view=results