Add e2e tests for turbo prune

[jaredpalmer]

Describe the feature you'd like to request

Add e2e tests for turbo prune --scope=<app> and turbo prune --scope=<app> --docker to https://github.com/vercel/turborepo/blob/main/cli/scripts/e2e/e2e.ts#L181

Describe the solution you'd like

• Add e2e tests for turbo prune --scope=<app>
  • It should assert that the generated lockfile only contains correct dependencies (from packages, deps, and the root), you can verify this in node.js in the test with https://github.com/yarnpkg/yarn/tree/master/packages/lockfile
  • It should assert that yarn install --frozen-lockfile works in the out directory
  • It should assert that turbo run works when run in the out directory
• Add e2e tests for turbo prune --scope=<app> --docker
  • It should assert correct folder structure
  • It should build a dockerfile that includes turbo prune --scope=<app> --docker, correct copy behavior, yarn install, and then turbo run build.
    • After the first docker build, it should change a dependency that doesn't impact the desired target or its deps, and re-run the docker build. It should be instant (no need to re-install)
    • It should change a dependency and verify that re-install and rebuild is indeed is necessary
• Make necessary changes to .devcontainer so that the tests can run (it may already be possible with docker in docker)
• Bonus points:
  • Write these tests with stubs for when we add support for prune for package managers

Describe alternatives you've considered

N/A