Package manager binary location to angular.json

[egaga]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [x] config
- [ ] help
- [ ] version
- [ ] doc

Versions

Relevant only: Angular CLI: 6.1.4

Repro steps

ng config cli.packageManager yarn
ng update @angular/core`

The log given by the failure

yarn not found

because yarn is not globally installed.

Desired functionality

Specify yarn location in angular.json (by a relative path). The reason is that yarn version should be project dependent, not globally installed and defined in PATH.

[hansl]

Duplicate of #11694

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