refactor: Use LPVSFileUtil API for getReader

[tiokim]

Pull Request

Description

It's refactored to use LPVSFileUtil API.
Unit tests of LPVSFileUtil have been updated to use assertEquals to improve accuracy.

Type of change

• Code cleanup/refactoring

Testing

This PR is verified by the unit tests.

Test Configuration:

• Java: v17
• LPVS Release: v1.x.x

Checklist:

• My code follows the style guidelines of this project
• My code meets the required code coverage for lines (90% and above)
• My code meets the required code coverage for branches (80% and above)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.61%. Comparing base (4e31ac1) to head (5a86800).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #535      +/-   ##
============================================
- Coverage     92.70%   92.61%   -0.10%     
+ Complexity      530      528       -2     
============================================
  Files            48       48              
  Lines          1741     1733       -8     
  Branches        209      208       -1     
============================================
- Hits           1614     1605       -9     
- Misses           63       64       +1     
  Partials         64       64              

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[o-kopysov]

LGTM

[t-naumenko]

LGTM