fix(core): new and migrate commands should exit with code

[Coly010]

Current Behavior

New and Migrate commands do not exit correctly when an error is thrown.

Expected Behavior

They should report the error code correct to process.exit to allow the command to fail correctly.

[nx-cloud]

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✅ Successfully ran 12 targets

• nx affected --target=build --base=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4 --parallel=3
• nx affected --target=e2e --base=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4 --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=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4 --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=lint --base=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4 --parallel=3
• nx affected --target=test --base=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4 --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=844679ed7844f4837ce27e2af181a720fbe412dd --head=590de9bed90a9a02058a9bfd29d33f6551ab17e4
• 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 9:51AM (UTC)

[github-actions]

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