condenser_api get_discussions_by_author_before_date tests moved to folder

...et_discussions_by_author_before_date/over_limit.orig.json

...get_discussions_by_author_before_date/over_limit.pat.json

..._discussions_by_author_before_date/over_limit.tavern.yaml

...rns/get_discussions_by_author_before_date/first.orig.json

...erns/get_discussions_by_author_before_date/first.pat.json

...s/get_discussions_by_author_before_date/first.tavern.yaml

...ns/get_discussions_by_author_before_date/second.orig.json

...rns/get_discussions_by_author_before_date/second.pat.json

.../get_discussions_by_author_before_date/second.tavern.yaml