chore(repo): ensure single copy of nx and @nx/devkit

[JamesHenry]

When using a prerelease copy of nx (and devkit) inside of the nx repo, our powerpack plugins would cause a different version to be pulled in by pnpm as well. This change forces a single copy to be resolved.

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	Nov 21, 2024 1:29pm

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✅ Successfully ran 4 targets

- [`nx affected --targets=lint,test,build,e2e,e2e-ci --base=02b8bbeffe8454bc2f92dbfa420ad76a9834edcf --head=ce604821a94dbb0ed8b0d4d6699e0092b28f2542 --parallel=3`](https://staging.nx.app/runs/ClN1E6S5AS?utm_source=pull-request&utm_medium=comment) - [`nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte`](https://staging.nx.app/runs/2AjbIW8jxx?utm_source=pull-request&utm_medium=comment) - [`nx-cloud record -- nx format:check --base=02b8bbeffe8454bc2f92dbfa420ad76a9834edcf --head=ce604821a94dbb0ed8b0d4d6699e0092b28f2542`](https://staging.nx.app/runs/3AnNsNYJ8i?utm_source=pull-request&utm_medium=comment) - [`nx documentation --no-dte`](https://staging.nx.app/runs/075Oju9mao?utm_source=pull-request&utm_medium=comment)

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