UX: Workspaces at project level (design exploration)
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## Description
Recommendation originating from [UX Scorecard](https://gitlab.com/gitlab-org/gitlab-design/-/issues/2445)
## Problem 1
Users have trouble understanding workspaces and how they relate to GitLab projects. The side nav is one of the first places they look. Combined with how the `Workspace` brand means something different to different people it can lead to the interpretation that a workspace spans multiple projects.
From [UX Scorecard](https://gitlab.com/gitlab-org/gitlab-design/-/issues/2531) :
- _“If I had just clicked Edit and seen workspaces I would not have been particularly drawn to use it just because I’m entirely unfamiliar with it”_
- _"Initially, I imagined ... that it will be just a general thing accessible through GitLab somewhere where I would click a button and it wouldn’t be directly attached to a project. I think it makes a lot of sense to attach it to a project. It's just not what I expected.”_
- _"I think just the name Workspace suggests to me, this is where I work, and when I personally work, I work on everything (not just one project) at the same time. That’s just where the name led me.“_
## Problem 2
Launching from the `Edit` button in a project is not as engaging as it could be.
From [UX Scorecard](https://gitlab.com/gitlab-org/gitlab-design/-/issues/2531) :
- _“If I had just clicked Edit and seen workspaces I would not have been particularly drawn to use it just because I’m entirely unfamiliar with it”_
## Problem 3
Clicking `Create workspace` from the `Edit` button in a project direct the user to `Your work > Workspaces > Create workspace page`. This is unexpected at best and confusing at worst. Users who are new to GitLab and don't fully understand the difference between `Your work` and `Project` in the navigation are especially confused.
From [UX Scorecard](https://gitlab.com/gitlab-org/gitlab-design/-/issues/2531) :
- _“Oh this tab wasn’t here before”_ (`Viewing Your Work > Create Workspace page` after clicking New Workspace in `Edit` button)
## Problem 4
Could we improve workspaces usefulness by allowing users to see all members workspaces in a project? Needs more investigation but this could be a useful collaboration feature.
From [UX Scorecard](https://gitlab.com/gitlab-org/gitlab-design/-/issues/2531) :
- _“It would be cool to see other people’s instances”_
- _"We had something like this (collaborative dev environments) at my last job. It was really useful"_
## Acceptance Criteria
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- [ ] Alignment on proposed solution
- [ ] Split into individual issues
## Proposed solution
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