Ensure there are no jdbc spans if otel sdk is disabled

[brunobat]

During the OTel performance work I noticed that the OTel jdbc wrapper was being run even if the OTel SDK was disabled at runtime.
The PR fixes the unnecessary execution of the span creation, therefore improving performance.

Also found that if the OTel extension was disabled at build time, quarkus would fail to start if the wrapper was present.
Could not create a test because NoNettyDataSourceConfigTest doesn't like the OTel extension.

[michalvavrik]

I think it looks good, thanks for fixing it @brunobat . I will leave @gsmet to decide if using quarkus.otel.sdk.disabled inside Agroal doesn't violate separation of concerns, I remember Guillaume helped with original impl.

[brunobat]

Will have to submit another commit on this PR.
Turns out Quarkus fails to start when quarkus.otel.enabled=false

[brunobat]

Updated the code and the PR description.

[gsmet]

Added two comments.

Would like to get @yrodiere 's opinion too.

[yrodiere]

I have doubts about how config is retrieved, but if tests pass... LGTM.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit a978058.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 17

📦 integration-tests/observability-lgtm

✖ io.quarkus.observability.test.LgtmReloadTest.testReload - History

• io.quarkus.builder.BuildException: Build failure: Build failed due to errors [error]: Build step io.quarkus.observability.deployment.ObservabilityDevServiceProcessor\#startContainers threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed for image docker.io/grafana/otel-lgtm:0.8.2 at io.quarkus.observability.deployment.ObservabilityDevServiceProcessor.lambda$startContainers$3(ObservabilityDevServiceProcessor.java:170) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) - java.lang.RuntimeException

java.lang.RuntimeException: 
io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.observability.deployment.ObservabilityDevServiceProcessor#startContainers threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed for image docker.io/grafana/otel-lgtm:0.8.2
	at io.quarkus.observability.deployment.ObservabilityDevServiceProcessor.lambda$startContainers$3(ObservabilityDevServiceProcessor.java:170)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at io.quarkus.observability.deployment.ObservabilityDevServiceProcessor.startContainers(ObservabilityDevServiceProcessor.java:113)
	at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:732)