Previously tests assumed there is `clickhouse-client` available in test machine
`$PATH`, which is not always true and will cause a test failure when ClickHouse
is not installed system-wide. This commit fixes that by utilizing
`CLICKHOUSE_CLIENT_BINARY` more which is substitued from `CLICKHOUSE_BINARY`
which is set as `-b` argument in `clickhouse-test`.
Use one clickhouse-client invocation instead of 300, in debug builds it
is significant - each spawn is ~1 second
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
