feat: use cmd/ctrl+enter to execute generator while in the UI form

[Cammisuli]

What it does

While in the UI form for generators/schematics, we can now press cmd + enter (or ctrl+enter for non macOS environments) to execute the form.

closes #1217

[nx-cloud]

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✅ Successfully ran 3 targets

• nx run-many --all --parallel --target=build --max-parallel=3
• nx run-many --all --parallel --target=test --max-parallel=3
• nx run-many --all --parallel --target=lint --max-parallel=3

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