Added tests for `get_discussions_by_feed` group, when reblogs are taken

...r_api_patterns/get_discussions_by_feed/bartcant.orig.json

...er_api_patterns/get_discussions_by_feed/bartcant.pat.json

...api_patterns/get_discussions_by_feed/bartcant.tavern.yaml

...r_api_patterns/get_discussions_by_feed/funthing.orig.json

...er_api_patterns/get_discussions_by_feed/funthing.pat.json

...api_patterns/get_discussions_by_feed/funthing.tavern.yaml

..._api_patterns/get_discussions_by_feed/roadscape.orig.json

...r_api_patterns/get_discussions_by_feed/roadscape.pat.json

...pi_patterns/get_discussions_by_feed/roadscape.tavern.yaml

...nser_api_patterns/get_discussions_by_feed/val-a.orig.json

...enser_api_patterns/get_discussions_by_feed/val-a.pat.json

...er_api_patterns/get_discussions_by_feed/val-a.tavern.yaml