fix(core): plugins should not be registered twice and should respect shutdown queue

[AgentEnder]

Fixes two issues:

• Plugins could be registered twice if first one is not finished loading when called second time
• Plugin worker shutdown didn't properly listen to plugin events

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Feb 28, 2024 8:38pm

[nx-cloud]

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🟥 Failed Commands
nx affected --target=e2e --base=f046c52e5c621a0b8108d3a9f2874a7a16464ab8 --head=9f14540d290fb2c4d198c73c8afbf04ca4f67290 --parallel=1

✅ Successfully ran 5 targets

• nx affected --targets=lint,test,build --base=f046c52e5c621a0b8108d3a9f2874a7a16464ab8 --head=9f14540d290fb2c4d198c73c8afbf04ca4f67290 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=f046c52e5c621a0b8108d3a9f2874a7a16464ab8 --head=9f14540d290fb2c4d198c73c8afbf04ca4f67290
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=f046c52e5c621a0b8108d3a9f2874a7a16464ab8 --head=9f14540d290fb2c4d198c73c8afbf04ca4f67290

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[github-actions]

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