[Compute] Add IP tag for VMSS and fix the name of list vm extension API.

[hyonholee]

Azure/azure-rest-api-specs#3152

Description

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• Please add REST spec PR link to the SDK PR
• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

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• Pull request includes test coverage for the included changes.

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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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[shahabhijeet]

Can you link the spec PR?
Also build your sdk locally so it updates the metadata.

[hyonholee]

@shahabhijeet I build the SDK locally, but nothing is updated after build.

[dsgouda]

LGTM subject to CIs passing

[shahabhijeet]

@azuresdkci retest this please