[tests] Use the typed accessors in test-generator
[tests] Use the typed accessors in test-generator

Other than using the GValue-based methods we should also be using
the typed JsonNode accessors and the newly added JsonObject and
JsonArray typed accessors.

Distrotech/json-glib,frida/json-glib,robtaylor/json-glib-gvariant,ebassi/json-glib,ebassi/json-glib,robtaylor/json-glib-gvariant,Distrotech/json-glib,ebassi/json-glib,GNOME/json-glib,oerdnj/json-glib,oerdnj/json-glib,frida/json-glib,oerdnj/json-glib,oerdnj/json-glib,Distrotech/json-glib,brauliobo/json-glib,brauliobo/json-glib,GNOME/json-glib,brauliobo/json-glib