[YSQL] Client \copy command can hit Snapshot too old exception during import data

[qvad]

Jira Link: DB-4334

Description

hits.tsv is a 80Gb tsv file. In progress in can be imported in 1h.
Need to define yb_client_admin_operation_timeout_sec=3600, otherwise copy will fail with 120 seconds timeout.

During importing data snapshot too old error may occur.

taqo=# \copy hits FROM '/mnt/d0/data/hits.tsv';
ERROR:  Snapshot too old: [Snapshot too old (yb/tablet/tablet_retention_policy.cc:117): Snapshot too old. Read point: { physical: 1669250301024215 }, earliest read time allowed: { physical: 1669250518548004 }, delta (usec): 217523789: kSnapshotTooOld (transaction error 4)]