Always load the CJS helpers when using require

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #12854 (comment).
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

The problem is that in older Babel version we used to inject require("interopRequireDefault") (without .default).
Webpack then loaded the mjs file (because of the module condition), which doesn't work because it returns the module namespace.

Thanks @AndriusBil for the repro!

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/42027/

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit acd2260:

Sandbox	Source
babel-repl-custom-plugin	Configuration
babel-plugin-multi-config	Configuration

[nicolo-ribaudo]

Will release when CI of #12867 passes