Azure credential subscoping

### Describe the solution you'd like

Polaris [currently doesn't subscope Azure credentials based on the provided locations](https://github.com/apache/polaris/blob/90c2580103e129b70ce3b128f1fdee3bceaa8edb/polaris-core/src/main/java/org/apache/polaris/core/storage/azure/AzureCredentialsStorageIntegration.java#L84), which is different from the other two storage formats.

Start in polaris-core/src/main/java/org/apache/polaris/core/storage/azure/AzureCredentialsStorageIntegration.java around line 84, then compare how the other two storage formats scope credentials from provided locations. Confirm the Azure integration applies equivalent location-based subscoping and validate the behavior against the existing storage integration checks.

Written by the indexing model from the issue text.