Backport of [ui] Namespaced and file-specified deps for consul-ui into release/1.19.x

[dhiaayachi]

Backport

This PR is auto-generated from hashicorp#21378 to be assessed for backporting due to the inclusion of the label backport/1.19.

The below text is copied from the body of the original PR.

---

Description

This resolves an ambiguous dependency resolution in consul-ui in the event that a developer attempted to yarn install or npm install from a non-workspace-root directory. This handles it in two ways:

• Namespaces with a @hashicorp/ prefix, reducing the risk of a hypothetical public registry squat situation should local packages ever stop being relative
• Explicitly locally dependency-links packages

Something to note with this is that the packages become a little more bound together than before; for example, it would be more difficult to maintain multiple valid versions of a sub-package here and let consul-ui differentiate between them. We could expand this into submodules some day, but not today.

---

Overview of commits

• 74792f6 - 4b87111 - dd731cf - cb53d9f - 8d13103