fix(core): listing plugin capabilities causes issues when returning null

[AgentEnder]

Current Behavior

loadNxPlugin may error when trying to load a module which is not an Nx plugin. This is because we set the name property on the object, which could be readonly, or similar.

getPluginCapabilities returns null on error, and calls loadNxPlugin.

Expected Behavior

getPluginCapabilities doesn't return null on error

Related Issue(s)

Fixes #15305

[vercel]

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Name	Status	Preview	Comments	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 27, 2023 at 11:51PM (UTC)

[nx-cloud]

☁️ Nx Cloud Report

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✅ Successfully ran 8 targets

• nx run-many -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=729ff7eac2521b5bc08b8e631992b984ec133c86 --head=3c446e95058f8a150e4c9e6c594d162dcff56d4f --exclude=e2e-storybook,e2e-storybook-angular --parallel=1
• nx affected --target=test --base=729ff7eac2521b5bc08b8e631992b984ec133c86 --head=3c446e95058f8a150e4c9e6c594d162dcff56d4f --parallel=1
• nx affected --target=build --base=729ff7eac2521b5bc08b8e631992b984ec133c86 --head=3c446e95058f8a150e4c9e6c594d162dcff56d4f --parallel=3
• nx affected --target=lint --base=729ff7eac2521b5bc08b8e631992b984ec133c86 --head=3c446e95058f8a150e4c9e6c594d162dcff56d4f --parallel=3
• nx run-many -t root-lint check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=729ff7eac2521b5bc08b8e631992b984ec133c86 --head=3c446e95058f8a150e4c9e6c594d162dcff56d4f
• nx documentation --no-dte

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[github-actions]

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