feat: added test.yml file to run tests in ci

[qianxuege]

Note: This is adapted from Alicia's PR #2

Name of PR: Add translator tests to CI workflow

Description:

• Added test/unit/test_translator.py to github CI workflow for pushes and pull requests.

Changes

What changes did you make to resolve the issue?

• Updated .github/workflows/test.yml to ensure all tests in the test/ directory are executed during CI.
• Verified CI triggers on both push and pull_request events for the main branch.

Does your change introduce new dependencies to this project? If so, list here.

• No — this PR does not add any new dependencies.

Validation

How did you trigger the change to show that it is working?

• Pushed a test branch with the new workflow updates.
• Observed that GitHub Actions executed the workflow automatically.
• Verified that pytest discovered and ran test/unit/test_translator.py as part of the suite.
• Confirmed all tests passed successfully.

[jarchenn]

These additions to the workflow add to the CI setup that automatically runs. Overall, these updates make the project more robust and aligned with any modern CI/CD best practices. All checks pass locally when I tested as well.