Remove DEBUG-level default logging from actions (#51459)

In 2bb31fe (v0.6.0!) we added DEBUG-level logging to the default config of
action loggers "for easier debugging". This change to the default config lives
on to this day. It does not obviously make debugging any easier any more, but
it does result in a good deal of log noise sometimes. This commit removes this
special case from the default config.

Closes #51198

distribution/src/config/log4j2.properties

@@ -1,9 +1,5 @@
 status = error
 
-# log action execution errors for easier debugging
-logger.action.name = org.elasticsearch.action
-logger.action.level = debug
-
 appender.console.type = Console
 appender.console.name = console
 appender.console.layout.type = PatternLayout