fix(core): workspace-generator errors should be propagated to nx

[meeroslav]

Current Behavior

The workspace-generator uses yargs to handle help and argument parsing which results in the following errors:

• positional arguments are causing the command to break even if the argument as passed as optional one

  nx workspace-generator some-name # this succeeds
  nx workspace-generator --name=some-name # this fails

• error reported in the default one from yargs and it's not very helpful

  Not enough non-option arguments: got 0, need at least 1
  

Expected Behavior

• Mandatory fields are marked as [required]
• Options can be passed as both flags and positionals (if defined as such)
• Useful errors should be reported
  

Related Issue(s)

Fixes #12677

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=fc6b85d9861f48e95f1b18314ff3920729e4920a --head=51116debf7b3e1b6852cf35778f63e6faa55e15c --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=test --base=fc6b85d9861f48e95f1b18314ff3920729e4920a --head=51116debf7b3e1b6852cf35778f63e6faa55e15c --parallel=1
• nx affected --target=build --base=fc6b85d9861f48e95f1b18314ff3920729e4920a --head=51116debf7b3e1b6852cf35778f63e6faa55e15c --parallel=3
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=fc6b85d9861f48e95f1b18314ff3920729e4920a --head=51116debf7b3e1b6852cf35778f63e6faa55e15c --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=fc6b85d9861f48e95f1b18314ff3920729e4920a --head=51116debf7b3e1b6852cf35778f63e6faa55e15c
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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Name	Status	Preview	Updated
nx-dev	❌ Failed (Inspect)		Nov 2, 2022 at 11:17PM (UTC)

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