Align WorkloadIdentityCredential proxy option name #47350
Description
We have a few variations across languages. Let's align on a simple, short name like EnableAzureProxy (see for example Azure/azure-sdk-for-go#25650). The rationale for preferring this name over the variants we have today is:
- it briefly summarizes the feature: a proxy for apps running on Azure
- WorkloadIdentityCredential doesn't require Azure but this feature does
- "Kubernetes" is implied because WorkloadIdentityCredential is designed for use in k8s pods
- "Token" is inaccurate because the proxy handles all requests, not just token requests, and also somewhat redundant because tokens are WorkloadIdentityCredential's only output