Update core-js to latest version

[Ajay-singh1]

Description

This PR updates the core-js version to the latest version which is version 3.42.0

Attached Screenshot which shows clean site build without any error or conflicts:-

Reviewers

• Ambient
• Docs
• Installation
• Networking
• Performance and Scalability
• Extensions and Telemetry
• Security
• Test and Release
• User Experience
• Developer Infrastructure
• Localization/Translation

[istio-testing]

Hi @Ajay-singh1. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[dhawton]

/ok-to-test

[craigbox]

I'll merge this, but I would like to understand what core-js is used for and why it's installed separately - it's not listed in https://github.com/istio/tools/blob/master/docker/build-tools/Dockerfile.

[Ajay-singh1]

core-js is used by babel as a dependency.At first I thought that this package was unnecessary because I didn't find it in the build tools. Is it a good idea to include this in istio/tools? @craigbox