Add resource percentage selector for api version 2026-06-01

[TuckerDale]

ARM (Control Plane) API Specification Update Pull Request

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[github-actions]

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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
Swagger	Microsoft.Authorization-policy
TypeSpec	Microsoft.Authorization
Go	sdk/resourcemanager/resources/armpolicy
Python	azure-mgmt-resource-policy
C#	Azure.ResourceManager.Resources.Policy
JavaScript	@azure/arm-policy
Java	com.azure.resourcemanager:azure-resourcemanager-resources-policy

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Comment generated by After APIView workflow run.

[rogergzou]

Should these types (Enrollment, Exemption, Variable, VariableValue) be getting removed?

[TuckerDale]

These types are only in preview right now, so I removed them for this version.