fix(azure): update DatastoreType import

[fengjikui]

Summary

• Stop importing DatastoreType from the removed azure.ai.ml._restclient.v2022_10_01 namespace.
• Add a small promptflow-azure compat module that uses the available v2022_10_01_preview namespace and falls back to the old namespace for older SDK layouts.
• Update the two promptflow-azure call sites to share the compat import.

Fixes #4176.

Verification

• uv run --with azure-ai-ml==1.33.0 python - <<'PY' ... verified the compat module resolves AzureBlob, AzureDataLakeGen2, and AzureFile under azure-ai-ml==1.33.0.
• python3 -m py_compile src/promptflow-azure/promptflow/azure/_utils/_datastore_type.py src/promptflow-azure/promptflow/azure/operations/_artifact_utilities.py src/promptflow-azure/promptflow/azure/_storage/blob/client.py src/promptflow-azure/tests/sdk_cli_azure_test/unittests/test_blob_client.py
• uvx black --check src/promptflow-azure/promptflow/azure/_utils/_datastore_type.py src/promptflow-azure/promptflow/azure/operations/_artifact_utilities.py src/promptflow-azure/promptflow/azure/_storage/blob/client.py src/promptflow-azure/tests/sdk_cli_azure_test/unittests/test_blob_client.py
• git diff --check

I also tried the repository's poetry install --with ci,test from src/promptflow-azure, but dependency resolution did not complete locally after several minutes, so I kept local validation focused on the import compatibility path.

[fengjikui]

@microsoft-github-policy-service agree

[github-actions]

Hi, thank you for your interest in helping to improve the prompt flow experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment.

[fengjikui]

Still active from my side. I rechecked that the PR is mergeable and the visible checks are green; happy to adjust if the DatastoreType compatibility import should follow a different preferred path.