[improve][test] Reduce logging overhead in tests

[lhotari]

Motivation

• tests use a logging configuration where the location of the log statement is logged. this is very expensive and unnecessary.
• this was noticed in test profiling (see [improve][test] Don't configure Mockito spying for MultiBrokerTestZKBaseTest #22250 for details of how profiling was performed)

Modifications

• don't log the location where the log was added since this causes a high overhead

Additional context

• The overhead is explain in https://logging.apache.org/log4j/2.x/manual/layouts.html#location-information

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[asafm]

Wow. I didn't know that!
Is this layout also used in the default log4j.xml we ship?

[lhotari]

Is this layout also used in the default log4j.xml we ship?

@asafm no, it was only used in tests.