[Microsoft.App 2025-10-02-preview] Update ingress params

[Tratcher]

Remove the obsolete IngressConfiguration Scale parameter.
Update the requestIdleTimeout description.

[github-actions]

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[github-actions]

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/appcontainers/armappcontainers
Java	com.azure.resourcemanager:azure-resourcemanager-appcontainers
JavaScript	@azure/arm-appcontainers

[ravimeda]

Please address the TypeSpec check failure. Refer to https://aka.ms/ci-fix

[Tratcher]

@ravimeda this is a modification of an existing type, why is it requiring we use a new format?