feat(core): prompt for available generators

[FrozenPandaz]

Current Behavior

There is no prompt when the generator does not exist on the default collection.

Expected Behavior

Default collection is deprecated and instead, Nx will prompt for the generator to use.

Related Issue(s)

Fixes #

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✅ Successfully ran 12 targets

• nx affected --target=build --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533 --parallel=3
• nx affected --target=e2e --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533 --exclude=e2e-detox,e2e-js,e2e-next,e2e-workspace-create,e2e-workspace-integrations,e2e-workspace-core,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-cli,e2e-nx-plugin,e2e-cypress,e2e-node,e2e-linter,e2e-jest,e2e-a...
• nx affected --target=e2e --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533 --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=lint --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533 --parallel=3
• nx affected --target=test --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533 --parallel=1
• nx build typedoc-theme
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn depcheck
• nx-cloud record -- yarn documentation
• nx-cloud record -- yarn nx format:check --base=c9897c61e65d876d6214ef20bfd6b3497fff0cc0 --head=f96eab766e15b8fc3670424b4fef45c4d4bf0533
• nx-cloud record -- yarn nx workspace-lint

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Name	Status	Preview	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	May 27, 2022 at 4:57PM (UTC)

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