Get rid of debug log messages complaining about missing OpenTelemetry marker classes

[adinauer]

Description

e.g.:

DEBUG: Class not available:io.sentry.opentelemetry.agent.AgentlessSpringMarker
java.lang.ClassNotFoundException: io.sentry.opentelemetry.agent.AgentlessSpringMarker
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)

We can just pass a NoOpLogger to the LoadClass instance.