SPR1-766 Remove superfluous response.ok check
SPR1-766 Remove superfluous response.ok check

All error statuses lead to exceptions in `complete_request` via our
custom "raise for status" implementation in `S3ChunkStore.request`.
We only check the response content if there were no exceptions, so it
is safe to assume that `response` exists and is OK at this point.

ska-sa/katdal