The `next/babel` and `babel-jest-preset` Babel presets bring in
conflicting plugins. This will cause Jest tests to fail.
This PR updates our own `@nx/next/babel` preset to remove the
conflicting plugin from `next/babel`. Import assertions are out of date
anyway, and we should be using import attributes (which
`babel-jest-preset` supports).
See: https://github.com/tc39/proposal-import-attributes
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## Current Behavior
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## Expected Behavior
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## Related Issue(s)
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Fixes #
* fix(nextjs): update babel setup to better support next apps
* fix(testing): remove babel-jest.config.json used in jest.config.js
- Fix `@nrwl/web/babel` to support Jest as well
