Redirects the legacy …/admin/projects/list[/…] addresses to the same
path without the list segment.
Until 2026-09 the project list lived at /admin/projects/list (the
Projects tab opened the Overview) and every project page was nested
under it — list/new, list/:id, list/:id/board,
list/:id/assignments/new… The list is the landing page now and the
project pages sit directly under /admin/projects. Bookmarks, host apps'
redirect_to values and mention links written before the move still
carry the segment, so two hidden tabs (projects/list and
projects/list/*rest) route here and this view drops it: the rest of the
path, the query string and the locale prefix are kept as they were.
A full redirect rather than push_navigate/2: it also works from the
disconnected (HTTP) mount, which is what a bookmark hits first.