With the release of Turborepo 2 we're renaming `pipeline` to `tasks`.
This PR updates the default settings logic to look in `tasks` for a
`build` task definition in addition to looking at `pipeline`. It also
updates the message to no longer mention Turbo configuration in
`package.json` as this is fully ignored in Turborepo 2.
Added a quick unit test to verify `build` task definitions are found in
the `tasks` section of `turbo.json`.
Please let me know if there are other tests/places I should update.
5dedc7b2ce