Deprecate bulk transcriptions endpoints

Once arkindex/worker-ml#38, arkindex/worker-ml#37, arkindex/worker-ml#36, arkindex/worker-ml#35 & #262 (closed) are done, we should deprecate the CreateTranscriptions and UpdateTranscriptions endpoints

added 1 deleted label

mentioned in issue #310 (closed)

assigned to @vrigal

mentioned in merge request !866 (merged)

closed

mentioned in commit f47dca8b