fix(nextjs): produce correct next.config.js file for production server

[jaysoo]

This PR fixes an issue where the generated next.config.js file errors out due to with-nx.js referencing relative paths that do no exist.

For reference, the reason we previously used a compiled version of with-nx.js rather than @nrwl/next/plugins/with-nx is because @nrwl/next installs development packages (e.g. Cypress, Webpack, etc.) that bloated the built artifact. See: #12150

This fix has two components:

1. Move dependencies on @nrwl/cypress, @nrwl/jest, and @nrwl/webpack. from packages/next/package.json into ensurePackage whenever they are used by generators. This change addresses the package size issue.
2. Remove the compiled version of with-nx.js and use the normal plugin again. This requires a check on the "phase" so that webpack and eslint configurations are only added when doing builds. By checking the phase, we no longer need access to Nx graph since everything has already been compiled into .next..

Current Behavior

Production build cannot run

Expected Behavior

Production build can run

Related Issue(s)

Fixes #15796

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated
nx-dev	⬜️ Ignored (Inspect)			Mar 22, 2023 at 5:35PM (UTC)

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✅ Successfully ran 8 targets

• nx run-many -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=44478fb57ec14b98f4f1a2e92144f8072a715d58 --head=cdd3192d6cdb34c444ded6fe1f4fa1a4d6c901de --parallel=1
• nx run-many -t root-lint check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=test --base=44478fb57ec14b98f4f1a2e92144f8072a715d58 --head=cdd3192d6cdb34c444ded6fe1f4fa1a4d6c901de --parallel=1
• nx affected --target=build --base=44478fb57ec14b98f4f1a2e92144f8072a715d58 --head=cdd3192d6cdb34c444ded6fe1f4fa1a4d6c901de --parallel=3
• nx affected --target=lint --base=44478fb57ec14b98f4f1a2e92144f8072a715d58 --head=cdd3192d6cdb34c444ded6fe1f4fa1a4d6c901de --parallel=3
• nx-cloud record -- nx format:check --base=44478fb57ec14b98f4f1a2e92144f8072a715d58 --head=cdd3192d6cdb34c444ded6fe1f4fa1a4d6c901de
• nx documentation --no-dte

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