Redirects retired legacy workflow editor URLs to the collaborative editor.

The legacy editor (WorkflowLive.Edit) has been sunset in favour of the collaborative editor (WorkflowLive.Collaborate). These actions keep old bookmarks working by redirecting /projects/:project_id/w/.../legacy URLs to their collaborative equivalents.

The collaborative editor renames the "followed run" param from a to run, so that one is remapped to keep old run bookmarks following the run. Other legacy params (e.g. s, m) depend on the editor's selection state to translate correctly, which isn't available here, so they're forwarded as-is.