Add integration tests for "opendal-oss" and "opendal-azdls"

### Is your feature request related to a problem or challenge?

"opendal-oss", "opendal-azdls" currently don't have integration tests and they're therefore marked as being experimental in the repo.

### Describe the solution you'd like

_No response_

### Willingness to contribute

None

Start by locating existing integration tests for other OpenDAL services in the iceberg-rust repository and compare how they are configured. Add coverage for both opendal-oss and opendal-azdls, with the work complete when both integrations are tested and can no longer be treated as untested experimental services.

Written by the indexing model from the issue text.