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.

Allows dedupe options for npm and yarn.

Closes #2883 

Closes #3274

Adds a new `rangeStrategy` value `lockfile-update'. Enabling this means you will get PRs that contain updates for the versions in your lock file (currently npm and yarn only) even if the range in the `package.json` file hasn't changed because the update is "in range".

Closes #1382 

Detects if `yarn.lock` contains `integrity` fields already and if so then runs `yarn` using v1.10.1 instead of the default v1.9.4.

Defaulting to ‘bundled’ (default behaviour), this option can be changed to ‘global’ if you wish Renovate to use globally installed npm, yarn, pnpm and lerna binaries. Note: composer always uses global regardless.

Detect strings in `yarn` `stderr` that indicate a registry problem and if found then throw a `registry-failure` error instead of continuing with a PR creation or update. This way they should be retried on each run until the registry is available again.

Closes #2474, Closes #2475

Closes #2039