Remove dependency on msrestazure: rdbms-connect

[nasc17]

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• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[yonzhan]

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

[github-actions]

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

[evelyn-ys]

/azp run

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Azure Pipelines successfully started running 2 pipeline(s).

[evelyn-ys]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[azclibot]

[Release] Update index.json for extension [ rdbms-connect ] : https://dev.azure.com/azclitools/release/_build/results?buildId=198820&view=results