FilterTest Handler: filter pipeline deepcopy #495
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We faced some concurrency issues in prod, where the object returned by pymongo in one call, after being edited (though not in the DB, and just temporarily) showed the edits in another API call. It meant that the pipeline of the filter being tested would be edited again and again in the scope of the API (and thankfully, not in the DB), making the filter incorrect.
This PR fixes that with a good old deepcopy of the JSON before editing anything