fix(core): only add keep existing versions if init generator supports it

[FrozenPandaz]

Current Behavior

Nx plugins which do not support keepExistingPackages fail to initialize via nx init or nx add

Expected Behavior

Nx plugins which do not support keepExistingPackages initializes properly via nx init and nx add

Related Issue(s)

Fixes #

[vercel]

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1 Skipped Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Mar 12, 2025 8:14pm

[nx-cloud]

View your CI Pipeline Execution ↗ for commit a5b740f.

Command	Status	Duration	Result
nx affected --targets=lint,test,build,e2e,e2e-c...	❌ Failed	48m 45s	View ↗
nx run-many -t check-imports check-commit check...	✅ Succeeded	16s	View ↗
nx-cloud record -- nx-cloud conformance:check	✅ Succeeded	2s	View ↗
nx-cloud record -- nx format:check --base=7f1e1...	✅ Succeeded	2s	View ↗
nx-cloud record -- nx sync:check	✅ Succeeded	1s	View ↗
nx documentation	✅ Succeeded	2m 55s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-03-12 23:58:02 UTC