Use inputs.wic_ref in concurrency judgement.

[ywang271828]

Problem Description:
When two PRs are opened simultaneously on WIC, the latter one will kill the github actions from the first one.

Reason:
This happens because actions from both PRs are running on the master branch of the PolusAI wic repo.

Fix:
Use the ref name of the incoming feature branch to differentiate PRs.

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.