Test: Add comprehensive integration tests for release workflow

[d-oit]

We need to add more comprehensive integration tests for the release workflow to ensure reliability.

Test scenarios needed:

• Version bump calculations
• Changelog generation
• Issue closure automation
• Error handling for failed releases

Testing approach:

• Mock GitHub API responses
• Test both success and failure scenarios
• Validate output formats
• Performance testing for large repositories

[d-oit]

🎉 This issue has been resolved in release v0.1.4!

Implemented: Comprehensive integration tests for the release workflow and overall system reliability.

New Test Suites Added:

• Crash Prevention Tests (19 test cases) - Ensures stability under various conditions
• Performance Tests (6 test cases) - Validates script performance characteristics
• Logging Function Tests (19 test cases) - Complete coverage of logging system
• Windows-Compatible Tests (16 test cases) - Cross-platform testing support

Enhanced Coverage:

• 100% function coverage achieved (16/16 functions)
• 9 comprehensive test suites running successfully
• 107+ individual test cases with 0 failures
• All major workflows tested including error scenarios

Test Quality Improvements:

• Enhanced coverage analysis to detect all test coverage
• Fixed test runner for strict mode compatibility
• Added proper exit handling across all test files
• Comprehensive mocked integration tests

Release: https://github.com/d-oit/gh-sub-issues/releases/tag/v0.1.4