Add unit tests for critical logic in Typescript package

[jerop]

Description:

Currently, there are no apparent automated tests for the run-gemini-cli action. To ensure the reliability and correctness of the action, comprehensive test coverage is required, especially for the critical logic branches identified during refactoring.

Depends on #373

Specific testing requirements:

1. Unit Tests for TypeScript Modules:
   • Develop unit tests for all functions and modules created during the refactoring process (e.g., input validation, installation logic, telemetry upload).
   • Achieve high code coverage for these modules, focusing on all conditional branches and edge cases.
2. Mocking External Dependencies:
   • Mock external calls (e.g., npm, git, docker, curl, gemini CLI) to ensure unit tests are fast and isolated.

Acceptance Criteria:

• A testing framework is integrated into the project.
• Unit tests are written for all refactored TypeScript modules.
• Test coverage reports demonstrate significant coverage of the action's core logic.
• Tests can be run easily via a npm script.

[gemini-cli]

🤖 Hi @jerop, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[gemini-cli]

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