Fix ServerFarmInstanceDetails for Microsoft.Web 2025-03-01

[joslinmicrosoft]

ARM (Control Plane) API Specification Update Pull Request

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• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
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• Update existing version to fix OpenAPI spec quality issues in S360.
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  • We are fixing an incorrectly specified property type (ServerFarmInstanceDetails) which was just introduced in the latest api-version, 2025-03-01. This new version has not yet been released.

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Go	sdk/resourcemanager/appservice/armappservice
Java	com.azure.resourcemanager:azure-resourcemanager-webappservice
JavaScript	@azure/arm-appservice

[reillyanderson]

lgtm!