Upgrade to Log4j2 2.25.1

[snicoll]

Upgrade to Log4j2 2.25.1.

[snicoll]

So the upgrade requires a bit of work (WIP):

• @PluginLoggerContext now requires a public setter even if the class is not.
• GraalVmProcessor now requires log4j.graalvm.groupId and log4j.graalvm.artifactId properties. This kicks off for any use of those plugin annotations.
• Update Log4j's configuration using reconfigure rather than start #46035