Fix Expand parameter for VirtualMachine_ListWithProperties

[grizzlytheodore]

This PR is migrated from #33958 because Compute had a big change to TypeSpec. This is fixing the TypeSpec file.
The original PR had all the approvals and sign offs. I added the same tags as the changes in that PR and this file are identical in Swagger

originally added recently here: #31933
the operation called virtualMachineImages_ListWithProperties, which has $expand parameter as enum.

For SDK and client tool needs, and to keep it consistent with virtualMachineImages_List $expand parameter, we need to keep it a string type

also return type in actual REST API is not pageable list, it is an array of object, consistent with virtualMachineImages_List, so fixing that as well.

Currently the SDKs do not work on this operation because the backend returns an array, not a pageable

ARM (Control Plane) API Specification Update Pull Request

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Language	API Review for Package
TypeSpec	Microsoft.Compute
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[grizzlytheodore]

@qiaozha could you please approve JS breaking change