Only one include filter can be applied at a time

[keiranjprice101]

Include filtering allows only one filter a time. It can be many included relations in the include, but not multiple given as separate query string parameters

[keiranjprice101]

@louise-davies Is this really an issue, would there be a time where it should be allowed to give a query such as /datafiles?include=["DATASET"]&include=["DATAFILEFORMAT"] when it can just work as
/datafiles?include=["DATASET","DATAFILEFORMAT"]

[louise-davies]

@keiranjprice101 If it is difficult then feel free to enforce that there can only be one include filter - just make sure to document it and perhaps have a specific error message sent back to the client if they do have more than one? It doesn't impact how the frontend uses it - it either only uses one include and if there was a future where there are two separate includes I can just parse them and merge them together and send them in the same query param