tests: run populate's jq programs over lock files of both shapes

Depending on the version of Nix, lock files name subdirectories as
attribute dir or as query parameter dir of the URL.  The VM tests run
one version, so only one shape gets covered there.  The jq programs for
flakes move to pkgs/populate/flake-jq.nix, and a new test, jq, runs them
without VMs over lock files of both shapes, with follows, removed and
cyclic follows, and inputs given by relative paths.

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