fix: ng g application with yarn 1

[vscaiceanu-1a]

Proposed change

Today, with yarn 1

yarn create @o3r my-workspace
cd my-workspace
yarn ng g application my-app

we get:

✔ Packages installed successfully.
error Running this command will add the dependency to the workspace root rather than the workspace itself, which might not be what you want - if you really meant it, make it explicit by running this command again with the -W flag (or --ignore-workspace-root-check).
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
✖ Package install failed, see above.
The Schematic workflow failed. See above.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[kpanot]

missing a pipeline based on yarn 1 to test the content of this :S.

[vscaiceanu-1a]

missing a pipeline based on yarn 1 to test the content of this :S.

We are far from having a working CI for end-to-end test with yarn 1. That is the goal of #1230

The goal of this PR is to allow users at least to be able to generate a first application within a monorepo while using yarn 1.