The stash_embed method no longer validates the query so this patch drops
the validation tests and instead just focuses on varifying the correct
output structure of the stash after the method call.
We have not lost validation however, it now happens only once at the
OpenAPI level and tests are present in t/db_dependent/api/v1/query.t
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl> Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>