Fix send_logs_level for clickhouse local

[kssenii]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fix send_logs_level for clickhouse local. Closes #35653.

[CurtizJ]

Maybe support send_logs_level with SET query if it's possible?

[kssenii]

It is possible but it will require to substitute logger initialisation with NullChannel () by default and set log level to none, then setting log level via query will work. But I am not sure that it will be better, what do you think?

I am talking about these lines:

ClickHouse/programs/local/LocalServer.cpp

Lines 483 to 487 in 60ecd49

	else
	{
	Poco::Logger::root().setLevel("none");
	Poco::Logger::root().setChannel(Poco::AutoPtr<Poco::NullChannel>(new Poco::NullChannel()));
	}

[CurtizJ]

Maybe reinitialise loggers when we receive SET send_logs_level query and throw an exception if server_logs_file is set?

[CurtizJ]

Stress test Backward compatibility check: Fatal message in clickhouse-server.log is not related to changes.