Switch Jest coverageProvider from babel (default) to v8

[ybiquitous]

Which issue, if any, is this issue related to?

Closes #4562

Is there anything in the PR that needs further explanation?

This change should prevent potential out-of-memory errors. See #7024 (comment).

Ref:

• https://jestjs.io/docs/29.0/configuration#coverageprovider-string
• https://jestjs.io/blog/2020/01/21/jest-25#v8-code-coverage

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[jeddy3]

LGTM, thank you.