[Feature] Option to Disable self-references

[dan-cooke]

Following on from the suggestion made here #3206 (comment) by @larixer

Problem

When using the node-linker and running yarn workspaces focus - a "self-reference" symlink is placed in the node_modules of each workspace.

packages/
    - A
       - node_modules 
            - A -> symlink back to packages/A

This is problematic in some cases where symlinks are traversed endlessly.

For example serverless will encounter an out of memory exception with this self-reference link.

Proposal

Add an option to .yarnrc.yml

disableSelfLink: true

[elliotdickison]

FWIW I ran into this trying to do a production build of a react-native Android app in a yarn monorepo. The PR will solve the problem for me nicely.

[missing1984]

ran into issue in my setup as well. I would even argue the default behavior should be no self-reference links. people can enable it when necessary.