Replace prepublish with prepack

[Widcket]

Description

This PR replaces the prepublish script with prepack, as the former is deprecated and does not run before publishing. prepublish has been in the package.json since the experimental days. See 1f55056#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519

References

• NPM script docs: https://docs.npmjs.com/cli/v7/using-npm/scripts

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main

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