fix(js): handle case where tslib or @swc/helpers are missing from externalNodes

[jaysoo]

This PR makes the findNpmDependencies function more resilient when a helper package is missing from externalNodes. If the workspace does not have tslib or @swc/helpers in externalNodes, it will not be included in a project's expected npm dependencies.

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)		Mar 26, 2024 8:34pm

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• nx affected -t e2e-macos --parallel=1 --base=a2ff37bbc67d9579de9a6f16c2ab2d7fd3f82c65 --head=262967d2dbf71364425468bb2bf8e6a6b4d2d65b
• nx affected --targets=e2e,e2e-ci --base=a2ff37bbc67d9579de9a6f16c2ab2d7fd3f82c65 --head=262967d2dbf71364425468bb2bf8e6a6b4d2d65b --parallel=1
• nx affected --targets=lint,test,build --base=a2ff37bbc67d9579de9a6f16c2ab2d7fd3f82c65 --head=262967d2dbf71364425468bb2bf8e6a6b4d2d65b --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=a2ff37bbc67d9579de9a6f16c2ab2d7fd3f82c65 --head=262967d2dbf71364425468bb2bf8e6a6b4d2d65b
• nx documentation --no-dte

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