Unscope admin, task-status, user, workers

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

• move admin/* to /-/admin/* (!1354 (merged))
• move task-status/* to /-/status/queues/* (!1355 (merged))
• move user/* to /-/user/* (!1355 (merged))
• move workers/* to /-/status/workers/* (!1355 (merged))

The views should be augmented with checks to prevent users from accidentally beign able to see details in those views that they should not see