Forward datastores.mount() kwargs in non-persistent path to restore MSI/IMDS auth parity

[Copilot]

MLClient.datastores.mount() accepted **kwargs but dropped them in the non-persistent mount path, preventing IMDS MSI parameters (for example client_id, identity_endpoint_type) from reaching dataprep/rslex. On non-AML-compute VMs this caused auth fallback to interactive/device-code flows and mount failure.

• What changed

  • In DatastoreOperations.mount(...), updated the non-persistent branch to forward **kwargs into:
    • rslex_fuse_subprocess_wrapper.start_fuse_mount_subprocess(...)
  • This preserves caller-supplied auth parameters for fuse mount subprocess startup.

• Unit test updates

  • Extended datastore non-persistent mount unit coverage to pass:
    • client_id="test-client-id"
    • identity_endpoint_type="Imds"
  • Added assertions verifying these kwargs are forwarded to start_fuse_mount_subprocess (alongside existing credential forwarding).

rslex_fuse_subprocess_wrapper.start_fuse_mount_subprocess(
    uri,
    mount_point,
    read_only,
    debug,
    credential=self._operation._config.credential,
    **kwargs,
)