Change code using fixed subset name in HPO

[eunwoosh]

Summary

This PR changes code using fixed subset name in hpo_api.py
In addition to that, I changed HPO code to raise error once one of HPO trials exit abnormally.

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 e2e tests for validation.
• 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) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 66.28%. Comparing base (a50ac7f) to head (15d94b2).

Files	Patch %	Lines
src/otx/hpo/hpo_runner.py	0.00%	4 Missing ⚠️
src/otx/engine/hpo/hpo_api.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3101   +/-   ##
========================================
  Coverage    66.27%   66.28%           
========================================
  Files          176      176           
  Lines        14931    14925    -6     
========================================
- Hits          9896     9893    -3     
+ Misses        5035     5032    -3     

Flag	Coverage Δ
py310	66.28% <0.00%> (+<0.01%)	⬆️
py311	66.28% <0.00%> (+0.01%)	⬆️

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[harimkang]

Please modify the target with this to the releases/2.0.0 branch.

[eunwoosh]

Please modify the target with this to the releases/2.0.0 branch.

I'll open same PR for releases/2.0.0 after it's merged.