fix(core): reject all promises in pool during shutdown

[FrozenPandaz]

Current Behavior

When shutdown is requested, we still await all the promises which may never complete.

Expected Behavior

When shutdown is requested, the pool will reject all promises so that the process exits.

Related Issue(s)

Fixes #

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Mar 6, 2024 10:00pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=d2cd8229537ca89fcc64d2582871cc615769f541 --head=2ca818b4f6885f0b766e32a0ced8e689f072c910 --parallel=1
• nx affected --targets=lint,test,build --base=d2cd8229537ca89fcc64d2582871cc615769f541 --head=2ca818b4f6885f0b766e32a0ced8e689f072c910 --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=d2cd8229537ca89fcc64d2582871cc615769f541 --head=2ca818b4f6885f0b766e32a0ced8e689f072c910
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=d2cd8229537ca89fcc64d2582871cc615769f541 --head=2ca818b4f6885f0b766e32a0ced8e689f072c910

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[github-actions]

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