fix(search): improve project root path detection logic

[beyondkmp]

My project structure is as follows:

/User/test/project/app/

There is a yarn.lock file under /User/test, and a pnpm-lock.yaml file under project. The project root directory I want to obtain is /User/test/Project, but what is returned is /User/test.

We need to search for all three, and then return the longest one.

[erickzhao]

Can you address the lint failures?

[erickzhao]

Can we also add additional test coverage for this use case?

[beyondkmp]

Yes. UT is added.