Azure: Support multiple storage credential prefixes

### Feature Request / Improvement

This would look similar to https://github.com/apache/iceberg/pull/12799 and https://github.com/apache/iceberg/pull/12881

### Query engine

None

### Willingness to contribute

- [ ] I can contribute this improvement/feature independently
- [ ] I would be willing to contribute this improvement/feature with guidance from the Iceberg community
- [ ] I cannot contribute this improvement/feature at this time

Start by reading the analogous pull requests #12799 and #12881, then locate Iceberg's Azure storage credential-prefix handling in the Java codebase. Determine the expected behavior for multiple prefixes from those changes and verify that the resulting implementation supports the requested Azure configuration.

Written by the indexing model from the issue text.