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>

Ref #5555

Co-authored-by: Rhys Arkins <rhys@arkins.net>

Use defined error constants throughout codebase.

Also moves related docker and env files

Adds new `ignoreScripts` config option. If set to true, managers such as npm and composer will skip running install scripts even if trustLevel is configured to high.

Closes #4567

When running the `lockFileMaintenance`, the lock file is removed before it gets recreated. When the lock file is not present, npm creates a `package-lock.json` by default, so we need to rename it to `npm-shrinkwrap.json` when we want to get an updated version.

This reverts commit b5c9dc8e.