Fix arrow support for semantic segmentation task

[sovrasov]

Summary

Can not test it here, since arrow testing infrastructure is not ready.
Resulting rt_info:

<label_ids value="5a7421812160eadb2c5fe7aa 5a7421812160eadb2c5fe7ab" />
<labels value="person car" />

before the fix:

<labels value="Empty Empty" />
<label_ids value="0 1" />

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.
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• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

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  Feel free to contact the maintainers if that's a concern.
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# Copyright (C) 2025 Intel Corporation
# SPDX-License-Identifier: Apache-2.0