[Optional] We can use npm workspaces now:

[sofisl]

          [Optional] We can use npm workspaces now:

• https://docs.npmjs.com/cli/v7/using-npm/workspaces

Which has the benefit of enabling top-level tests for all workspaces/packages among other features.

Originally posted by @d-goog in https://github.com/googleapis/gax-nodejs/pull/1699#discussion_r1954972792