Handle path separators in the subset when exporting a datumaro dataset

[jihyeonyi]

Summary

Ticket: 152928
Raise an error when exporting a dataset in Datumaro format if the subset name contains path separators.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT 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: MIT

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.07%. Comparing base (ff5fd94) to head (59074ac).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/datumaro/components/errors.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1615      +/-   ##
===========================================
+ Coverage    81.06%   81.07%   +0.01%     
===========================================
  Files          278      278              
  Lines        32517    32588      +71     
  Branches      6607     6620      +13     
===========================================
+ Hits         26360    26422      +62     
- Misses        4701     4710       +9     
  Partials      1456     1456              

Flag	Coverage Δ
ubuntu-20.04_Python-3.10	81.06% <95.45%> (+0.01%)	⬆️
windows-2022_Python-3.10	81.05% <95.45%> (+0.01%)	⬆️

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[sooahleex]

Looks good to me