Fix zero-shot learn for ov model

[sungchul2]

Summary

This PR includes:

• Fix index error when concatenating original self.used_indices and label.
  • self.used_indices was numpy array with ndim=1, but label was numpy array with ndim=0 or single integer.

    ...
       self.used_indices: np.ndarray = np.concatenate((self.used_indices, label))
    ValueError: all the input arrays must have same number of dimensions, but the array at index 0 has 1 dimension(s) and the array at index 1 has 0 dimension(s)

• Enable to handle threshold and num_bg_points for infer through args
• Update related tests
• Add integration tests for infer without pre-defined reference_info in tests/integration/cli/test_export_inference.py
  • order for tests:
    • otx train
    • otx test w/o reference_info -> implicitly re-run otx train for torch model
    • otx test w/ reference_info
    • otx export
    • otx test exported model w/o reference_info -> implicitly re-run otx train for exported model
    • otx test exported model w/ reference_info
    • otx optimize
    • otx test optimized model w/o reference_info -> implicitly re-run otx train for optimized model
    • otx test optimized model w/ reference_info

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[sovrasov]

@sungchul2 do we have now an integration test for OVModel.learn()?

[sungchul2]

@sungchul2 do we have now an integration test for OVModel.learn()?

Added at 6c524ff.