api/graph: Handle query parameters that might be passed in graph_query
It is possible to pass query parameters in the graph_query URL argument of the Web API graph endpoint if the ? character is quoted.
So add extra processing in the endpoint implementation to merge the query parameters extracted from the graph_query value and those coming from the django request.
The purpose is to avoid some query parameters to be silently ignored when requesting the graph API.
Migrated from D6919 (view on Phabricator)