Add Service Upgrade API changes / Azure Search / 2025-02-01-preview

[marcopiuma]

ARM (Control Plane) API Specification Update Pull Request

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[marcopiuma]

@efrainretana updated PR to address some of your feedback

[mrcarter8]

Assuming the "lastModified" properties are updated any time service metadata is changed by the customer, we will still need to include serviceUpgradedAt to know the version of the service was last changed. This is how we'll know the current version of the service and whether there is an upgrade available.

[mrcarter8]

Since we have location and sku as top level values, I wonder if we should elevate systemData to a top level node vs keeping it under the properties node.