This commit fixes the `testWithQueryFrontend` test, which was broken by

gargantext/haskell-gargantext@6bc41d73

However, this was followed by a frontend fix, which was modified to deal
with the next format:

gargantext/purescript-gargantext!374 (diffs)

Therefore, it's fine to fix the test here.

This commits changes the `PhyloData` data structure to
include a proper `GraphData` in the `pd_data` field. The
`GraphData` is almost complete, but the `objects` field needs
to be further refined from a generic JSON `Value` to proper
Haskell types.