[v3-0-test] Remove duplicate 'mock_supervisor_comms' pytest fixtures from core (#49457)#52080

ashb merged 1 commit intov3-0-testapache/airflow:v3-0-testfrom

backport-493402d-v3-0-testapache/airflow:backport-493402d-v3-0-testCopy head branch name to clipboard