Can't load a project with an older workspace to a junction

Summary

I recently updated buildstream snapshot, and I can't run bst build anymore because I need to "recreate" a workspace, which I can't do using bst. The workspace in question is a junction, and that's probably why it's harder than an ordinary workspace.

(I know I can remove .bst/workspaces.yml as a workaround, but a user isn't supposed to know)

Steps to reproduce

• install lastest buildstream snapshot (1.93.1)
• open a workspace on a junction
• update to latest master

What is the current bug behavior?

Any command I run is answered by

Error loading project: Workspace configuration format version 3 not supported.Please recreate this workspace.

even trying to list the workspaces or close the workspace that is causing the problem.

What is the expected correct behavior?

• Tell which workspace is causing this.
• Allow "recreating" the workspace from the command line.
• Have a space after punctuation in the error message.

Other relevant information

• BuildStream version affected: f126f0af

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