Package: Replace fs-extra with rimraf.

[epiqueras]

It surfaced in this thread, that we only use fs-extra for its remove function. We already have rimraf which does the same thing, and we need it for its CLI, so it makes sense to replace fs-extra with rimraf and avoid pulling in an extra dependency.

[ntwb]

Node.js 12.10: Add recursive option to rmdir() in #29168

https://nodejs.org/en/blog/release/v12.10.0/

I don't think we need rimraf at all, this can be achieved with fs.rmdir()

Background reading: https://dev.to/boneskull/recursive-directory-removal-in-node-js-239f

[youknowriad]

@ntwb Oh! I didn't know about that :) Thanks for sharing.

[epiqueras]

I didn't use it, because it's still "Stability 1".

Stability: 1 - Experimental. The feature is not subject to Semantic Versioning rules. Non-backward compatible changes or removal may occur in any future release. Use of the feature is not recommended in production environments.