CAMEL-24057: check actually-used classes in @ConditionalOnClass for access log configurations [4.18.x]

[Croway]

Summary

Claude Code on behalf of Federico Mariani

Backport of #1850 to camel-spring-boot-4.18.x.

@ConditionalOnClass(name = "io.undertow.Undertow") only checks for the top-level Undertow class, but the access log configurations use internal classes from io.undertow.server.handlers.accesslog.*. On JBoss EAP, the top-level class is visible (JBoss is built on Undertow) but the modular classloader doesn't export all internal packages, causing ClassNotFoundException.

This is a live bug on 4.18.x where the Undertow code is fully active (unlike main where it's commented out).

• Updated ManagementAccessLogConfiguration.UndertowAccessLogCustomizerConfiguration to also check for AccessLogHandler and JBossLoggingAccessLogReceiver
• Updated ManagementAccessLogConfiguration.TomcatAccessLogCustomizerConfiguration to also check for AccessLogValve (defensive consistency)
• Updated UndertowAccessLogConfiguration to also check for AccessLogHandler and JBossLoggingAccessLogReceiver

Test plan

• CI passes