Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Renovate will no longer embed npm, yarn and pnpm as dependencies. Therefore, if you are not running via the Docker full image, then you need to ensure that any of these managers are installed prior to running Renovate. This is inline with other managers such as Gradle or Poetry that require installation alongside Renovate too.

Closes #4208

BREAKING CHANGE: npm, yarn and pnpm are no longer embedded with the installation

* feat: yarn 2

* Apply suggestions from code review

Co-Authored-By: Michael Kriese <michael.kriese@visualon.de>

* refactor: move yarnMajorVersion test

* test: apply patch from @JamieMagee

see https://github.com/renovatebot/renovate/pull/5657#issuecomment-611205192



* test: update snapshots

* prettier-fix

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>

* chore(deps): update dependency prettier to v2

* Run prettier-fix

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>

This reverts commit c974929a.

Co-Authored-By: Michael Kriese <michael.kriese@visualon.de>

Ref #5555