Reduce memory consumption of Projects::BlobController#show (top-3 mem bytes, 50th_p)

This endpoint is top-3 by 50th percentile of json.mem_bytes (3,448,387,658 bytes) endpoint during the last 14 days.

The report: https://log.gprd.gitlab.net/goto/51df0e2febdcb8d000ceb8f6deb1112c

Details

json.meta.caller_id.keyword: Descending	json.method.keyword: Descending	Count	50th percentile of json.mem_bytes	95th percentile of json.mem_bytes	99th percentile of json.mem_bytes	50th percentile of json.mem_objects	75th percentile of json.mem_objects	95th percentile of json.mem_objects	99th percentile of json.mem_objects
Projects::BlobController#show	GET	435	3,448,387,658.4	5,010,086,803	7,910,401,446.8	10,400,540	11,028,686	28,039,351.75	78,828,843.45