[3.20] Remove some dead code in Panache using Hibernate ORM internals

[yrodiere]

Backport of 961d2d4

Necessary because these internals are changing in Hibernate ORM 6.6 as part of
hibernate/hibernate-orm#11227, so this dead code may not compile anymore when we upgrade to the next 6.6.

@jmartisk @gsmet assuming this compiles (meaning the code is really dead even on this branch), could this be merged?

Also, do I need to care about Quarkus 3.15? Because backporting to that branch will be more challenging.

cc @beikov

[quarkus-bot]

/cc @aloubyansky (3.20), @gastaldi (3.20), @gsmet (3.20), @jmartisk (3.20), @rsvoboda (3.20)

[rsvoboda]

Also, do I need to care about Quarkus 3.15?

I don't think so, 3.20 and 3.27 are the active LTS streams. 3.15 is history now :)

[jmartisk]

Thanks, we will probably take this for 3.20.5

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit c0fcfa8.

✅ 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

📦 extensions/smallrye-reactive-messaging-kafka/deployment

❌ io.quarkus.smallrye.reactivemessaging.kafka.deployment.testing.KafkaDevServicesContinuousTestingTestCase.testContinuousTestingScenario2 - History

• io.quarkus.builder.BuildException: Build failure: Build failed due to errors [error]: Build step io.quarkus.apicurio.registry.devservice.DevServicesApicurioRegistryProcessor\#startApicurioRegistryDevService threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed for image quay.io/apicurio/apicurio-registry-mem:2.4.2.Final at io.quarkus.apicurio.registry.devservice.DevServicesApicurioRegistryProcessor.startApicurioRegistryDevService(DevServicesApicurioRegistryProcessor.java:90) at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:732) at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:856) - java.lang.RuntimeException

java.lang.RuntimeException: 
io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.apicurio.registry.devservice.DevServicesApicurioRegistryProcessor#startApicurioRegistryDevService threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed for image quay.io/apicurio/apicurio-registry-mem:2.4.2.Final
	at io.quarkus.apicurio.registry.devservice.DevServicesApicurioRegistryProcessor.startApicurioRegistryDevService(DevServicesApicurioRegistryProcessor.java:90)
	at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:732)
	at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:856)
	at io.quarkus.builder.BuildContext.run(BuildContext.java:255)
	at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)

---

⚙️ MicroProfile TCKs Tests

📦 tcks/microprofile-lra

❌ org.eclipse.microprofile.lra.tck.TckRecoveryTests.testCancelWhenParticipantIsUnavailable - History

• Expecting the metric Compensated callback was called Expected: a value equal to or greater than <1> but: <0> was less than <1> - java.lang.AssertionError

java.lang.AssertionError: 
Expecting the metric Compensated callback was called
Expected: a value equal to or greater than <1>
     but: <0> was less than <1>
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.eclipse.microprofile.lra.tck.TckRecoveryTests.assertMetricCallbackCalled(TckRecoveryTests.java:210)
	at org.eclipse.microprofile.lra.tck.TckRecoveryTests.testCancelWhenParticipantIsUnavailable(TckRecoveryTests.java:195)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[jmartisk]

@rsvoboda, I'll merge this one right away so that the CI of #51216 can run properly before our next backport meeting