Move /work-request/ url to be inside /<scope>/<workspace>

See https://salsa.debian.org/freexian-team/debusine/-/blob/devel/docs/reference/devel-blueprints/url-redesign.rst?ref_type=heads

The /<scope>/work-request/* URLs should move to /<scopename>/<workspace_name>/status/work-request/* and work only with work requests in the given workspace.