fix(core): ensure plugin testing uses correct pm for install

[meeroslav]

When running tests in a temp folder where a workspace has been generated with different package manager than the root one, the ensureNxPackage and newNxProject will fail.

The runNxNewCommand always generates workspace with npm which might not be matching the root package manager. The failure has been detected on nx-react-workspace with Yarn v4

Current Behavior

runPackageManagerInstall will use the package manager detected from the root of the repo regardless what package manager is set in the folder where we are running the command.

Expected Behavior

runPackageManagerInstall should detect the package manager from the folder where it's being run.

Related Issue(s)

Fixes #

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Nov 6, 2023 11:33am

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✅ Successfully ran 5 targets

• nx affected --target=e2e --base=1d62dce6c3e9eecc878819d7c2e19e03087f2fab --head=8d95b3346a37ed5e8460935b5c18769d8145b393 --parallel=1
• nx affected --targets=lint,test,build --base=1d62dce6c3e9eecc878819d7c2e19e03087f2fab --head=8d95b3346a37ed5e8460935b5c18769d8145b393 --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=1d62dce6c3e9eecc878819d7c2e19e03087f2fab --head=8d95b3346a37ed5e8460935b5c18769d8145b393
• nx documentation --no-dte

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