After ClickHouse became systemd aware (#43400), it waits not more then
TimeoutStartSec (1m30sec by default), while before it simply ensures
that the process is there.
And likely 1m30sec can be not enough for some cluster, and this will
lead to endless restarts.
At first I've increased it to 10min, but there was a comment about that
this is not enough, and I agree with this.
But I'm not sure that using "inifinity" is a good option, but I cannot
think of any downsides of this.
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>