[arm-common-types]: percentComplete should be double

[dolauli]

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Correction to Existing Type

Describe the change, Provide the desired TypeSpec or json-schema for the change as appropriate.

In typespec-azure-resource-manager, the type of percentComplete is float64. While in common types in swagger repo, we do not specify "format": "double" for it.

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Checklist

• Follow our Code of Conduct
• Change is approved by Arm API Review
• Please update issue title and choose the change type.