Remove msrestazure dependency in Fleet extension

[jim-minter]

Remove msrestazure dependency in Fleet extension

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Related command

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• 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.

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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]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @jim-minter,
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]

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

[jsntcy]

@jim-minter, did you run related tests using the command azdev test xxx locally?

[jim-minter]

@jim-minter, did you run related tests using the command azdev test xxx locally?

@jsntcy, yes.

[jim-minter]

Please merge.

[azclibot]

[Release] Update index.json for extension [ fleet ] : https://dev.azure.com/azclitools/release/_build/results?buildId=187214&view=results