chore(integration): use offline install (#9599)
### Description
This PR does 3 things:
- Switch to use `--offline` when performing `npm install` to ensure we
are only using internal packages in our fixtures. We only do it for
`npm` as it lacks a `workspace` protocol.
- Add a `util` package that we were referencing in our nested workspace
fixture
- Add `--no-install` flag for tests that don't need to install deps.
Currently only used for our framework inference test where the presence
of `next` in a `package.json` is all we need. We never actually need
`next`.
### Testing Instructions
Passes in CI
