US client retries non-idempotent requests

[Max Zuev]

datalens-backend/lib/dl_core/dl_core/united_storage_client_aio.py

Line 155 in 6c0706a

 retry_methods={"GET", "POST", "PUT", "DELETE"},  # TODO: really retry all of them?.. 

Restarting POST requests to US is unsafe. I would suggest to remove POST from retry_methods.

Another strange thing is related to the codes:

datalens-backend/lib/dl_core/dl_core/united_storage_client_aio.py

Line 131 in 6c0706a

 self._retry_codes = {408, 429, 500, 502, 503, 504} 

Retrying 408 and 429 is a way to completely shut down an overloaded service