Make the OTel starter work with GraalVM native 22 and 23

[jeanbisutti]

GraalVM native is supported by Spring Boot for version 22 or above: https://docs.spring.io/spring-boot/system-requirements.html#getting-started.system-requirements.graal

So, this PR executes the GraalVM native tests for 22 and 23.

[jeanbisutti]

--initialize-at-build-time=io.opentelemetry.instrumentation.logback.appender.v1_0.internal.LoggingEventMapper was introduced in the first GraalVM native tests to make the OTel Logback appender work on native mode.

It has led to the addition of other build time initializations when additional features were added to this repo. The strict-image-heap mode enabled by default from GraalVM 22 makes the things worse.

However, the LoggingEventMapper build time initialization is no longer needed and other build time initializations can be removed.