The code for these two are almost identical, so consolidate into one codebase.
Also adjusts the `pnpm test` script to allow for specifying a file name to be executed, instead of running all tests.
### Related Issues
Improves how `vc build` handles monorepos. In short, this introduces
monorepo manager detection logic and then some helpful defaults so users
don't have to manually specify a `buildCommand` or `installCommand` when
linking a project within a monorepo.
### 📋 Checklist
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#### Tests
- [ ] The code changed/added as part of this PR has been covered with
tests
- [ ] All tests pass locally with `yarn test-unit`
#### Code Review
- [ ] This PR has a concise title and thorough description useful to a
reviewer
- [ ] Issue from task tracker has a link to this PR
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
