[Bug] Use ephemeric pool in merge operations

[Lesikv]

Caused by: tech.ytsaurus.client.rpc.RpcError: 'Internal RPC call failed' <== 'Operation has failed to start' <== 'Pool name "robot-cloud.dwh.dev" must match regular expression "[-_a-z0-9:A-Z]+"'; full error:

[Kontakter]

Yes, we know about that and we will support ability to specify regex for pool names

[gritukan]

I guess there are two issues here. The first one is about regexes for pool names and the second one is about starting merge jobs outside of the SPYT pool.

[renadeen]

You can now configure pool name validation regular expressions via dynamic configuration. Regular pool names are configured in master config (//sys/@config). Ephemeral pool names are configured in scheduler config (//sys/scheduler/config).
stable/23.1
stable/23.2
trunk