test: increased test coverage for API Endpoints

[IshwaryaSriram]

This PR addresses #240 and adds unit test cases, ensuring at least 80% test coverage for src/service/routes/*

Note:

1. No changes to existing code base logic (except for logger in src/service/routes/push.js); purely test additions.
2. This is my first contribution and part of the Citi Hackathon.

Please review the PR and let me know if there are any updates or changes needed.

[linux-foundation-easycla]

• ✅ login: coopernetes / name: Thomas Cooper (7f87fd5)
• ❌ - login: @IshwaryaSriram . The commit (c18deb1, 576b50c) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[coopernetes]

Hi @IshwaryaSriram thank you for the contribution! Please remember to sign the CLA so this PR can be eventually merged.

[coopernetes]

Hmm... Two of the tests are failing in CI. Can you review the logs and resolve the failures?

https://github.com/finos/git-proxy/actions/runs/13342403098/job/37268710992?pr=802

  56 passing (11s)
  2 failing

  1) clear bare and local clones
       pull remote generates a local .remote folder:
     Error: Timeout of 5000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/runner/work/git-proxy/git-proxy/test/testClearBareClone.test.js)
      at listOnTimeout (node:internal/timers:569:17)
      at process.processTimers (node:internal/timers:512:7)

  2) validate config files
       all invalid config files should fail validation:
     Uncaught Error: ENOTEMPTY: directory not empty, rmdir './.remote/1739599657030/git-proxy/.git/refs'