fix(web): undo core-js removal

[jaysoo]

We need to check if it is still needed in polyfills before removing. Let's keep it for now since users probably wouldn't remove polyfillts.ts themselves, so likely will need core-js for older projects.

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 0:14am

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --base= --head=
• nx affected --target=e2e --base=79fa3fb0ead486e33a7e00b5c13a0f2545278202 --head=fb8bf130f3aa597ebcef97886f9d10472c42c47c --parallel=1
• nx affected --target=test --base=79fa3fb0ead486e33a7e00b5c13a0f2545278202 --head=fb8bf130f3aa597ebcef97886f9d10472c42c47c --parallel=1
• nx affected --target=build --base=79fa3fb0ead486e33a7e00b5c13a0f2545278202 --head=fb8bf130f3aa597ebcef97886f9d10472c42c47c --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck check-codeowners --parallel=1 --no-dte
• nx affected --target=lint --base=79fa3fb0ead486e33a7e00b5c13a0f2545278202 --head=fb8bf130f3aa597ebcef97886f9d10472c42c47c --parallel=3
• nx-cloud record -- nx format:check --base=79fa3fb0ead486e33a7e00b5c13a0f2545278202 --head=fb8bf130f3aa597ebcef97886f9d10472c42c47c
• nx documentation --no-dte

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