feat(nest): use helper to determine project name and root in project generators

[leosvelperez]

Updates the Nest plugin project generators (application and library) to use the helper to determine the project name and root.

For more context on the changes, see: #18420

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 22, 2023 7:57am

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4 --parallel=1
• linux nx affected --target=build --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4 --parallel=3
• linux nx affected --target=test --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4 --parallel=1
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4 --parallel=3
• nx-cloud record -- nx format:check --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=231a998e004c13e559c171ba6c164a9127886153 --head=f7777384af7c6901753ddb059cd60c23116f29b4

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