Adding support for deep delete for disks

[srcharug]

All SDK Contribution checklist:

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• Please open PR in Draft mode if it is:
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• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
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Testing Guidelines

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Additional management plane SDK specific contribution checklist:

Note: Only applies to Microsoft.Azure.Management.[RP] or Azure.ResourceManager.[RP]

• Include updated management metadata.
• Update AzureRP.props to add/remove version info to maintain up to date API versions.

Management plane SDK Troubleshooting

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Old outstanding PR cleanup

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[grizzlytheodore]

/check-enforcer evaluate

[Sandido]

Top 3 files were already added previously, but Git did not affect them so this merge went fine.