feat(angular): add flag for skipping the postinstall script in relevant generators

[stianmorsund]

Current Behavior

ngcc is always added to postinstall in package.json when running workspace-generators.

Expected Behavior

That it is possible to skip adding ngcc if not needed. E.g if the workspace is using only Angular Ivy-compatible dependencies, this postinstall-step is not needed.

Related Issue(s)

Fixes #10062

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=38345dae3a14e3b51227b30da2902886d1ffe24c --head=6eccabd5146271d1758ec9555040cd4053e5e60f --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=test --base=38345dae3a14e3b51227b30da2902886d1ffe24c --head=6eccabd5146271d1758ec9555040cd4053e5e60f --parallel=1
• nx affected --target=build --base=38345dae3a14e3b51227b30da2902886d1ffe24c --head=6eccabd5146271d1758ec9555040cd4053e5e60f --parallel=3
• nx affected --target=lint --base=38345dae3a14e3b51227b30da2902886d1ffe24c --head=6eccabd5146271d1758ec9555040cd4053e5e60f --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn documentation
• nx build typedoc-theme
• nx-cloud record -- yarn depcheck
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=38345dae3a14e3b51227b30da2902886d1ffe24c --head=6eccabd5146271d1758ec9555040cd4053e5e60f
• nx-cloud record -- yarn check-imports

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Name	Status	Preview	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	May 9, 2022 at 11:19AM (UTC)

[leosvelperez]

Thanks for the contribution!

It overall looks good to me. I just left a few minor changes to the description of the flag. Please make sure to update the generated docs when applying the changes.

[leosvelperez]

LGTM!

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.