Improve workspaces empty state

[gtsiolis]

Problem to solve

While we're adding new features like Teams & Projects new patterns come up like better empty state components. In #4401, the empty state for the projects list has slightly made the product more intuitive to use by adding a small illustration above the text elements.

Proposal

Let's improve the workspaces empty state by adding an illustration above the text elements.

Projects Empty State	Workspaces Empty State (BEFORE)	Workspaces Empty State (AFTER)

See relevant specs.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gtsiolis]

Re-opening as this is still relevant.