fix(nextjs): move next/constants from top-level import to when it is needed

[jaysoo]

If you create a new Nx workspace without @nx/next plugin, then run nx add @nx/next it will error out due to a missing next/constants import. This is because next has not been installed via the init generator yet.

Current Behavior

nx add @nx/next should breaks.

Expected Behavior

nx add @nx/next should work.

Related Issue(s)

Fixes #

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Feb 5, 2024 3:58pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=a5246650730de95bc4081de1f86e8fee6aa30e72 --head=442454a78ac3d7cf9a62caf1af979e8df45fac81 --parallel=1
• nx affected --targets=lint,test,build --base=a5246650730de95bc4081de1f86e8fee6aa30e72 --head=442454a78ac3d7cf9a62caf1af979e8df45fac81 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=a5246650730de95bc4081de1f86e8fee6aa30e72 --head=442454a78ac3d7cf9a62caf1af979e8df45fac81
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=a5246650730de95bc4081de1f86e8fee6aa30e72 --head=442454a78ac3d7cf9a62caf1af979e8df45fac81

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[github-actions]

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