Passing `?minimal=true` to the /lists API returns all lists without
additional metadata (subscriber count) which is orders of magnitude
faster than counting subscribers per list in large DBs.
The frontend intitialization always calls the GET /lists API on load
to keep it available in multiple contexts like the new campaign page.
However, this "boot up" call does not need additional metdata. This
initialization GET /lists call now calls /lists?minimal=true.
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