PR #98390 - cli: compute --drain-wait based on cluster setting values

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#98390
Commit: cockroachdb/cockroach@18eac87
Fixes: cockroachdb/cockroach#98388

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Release note (cli change): The --drain-wait argument for the drain
command will be automatically increased if the command detects that it
is smaller than the sum of server.shutdown.drain_wait,
server.shutdown.connection_wait, server.shutdown.query_wait times two,
and server.shutdown.lease_transfer_wait. If the --drain-wait argument is
0, then no timeout is used.

This recommendation was already documented, but now the advice will be
applied automatically.

Jira Issue: DOC-7204