Remove config customizer

[geoand]

This is no longer used anywhere, so let's remove it

Resolves: #5332

[quarkus-bot]

This workflow status is outdated as a new workflow run has been triggered.

Failing Jobs - Building 2fb4c7f

Status	Name	Step	Failures	Logs	Raw logs
✖	Initial JDK 11 Build	Build	Failures	Logs	Raw logs

Failures

⚙️ Initial JDK 11 Build #

- Failing: core/deployment 
! Skipped: core/test-extension/deployment core/test-extension/runtime devtools/bom-descriptor-json and 610 more

📦 core/deployment

✖ Failed to execute goal net.revelc.code:impsort-maven-plugin:1.6.2:check (check-imports) on project quarkus-core-deployment: Imports are not sorted in /home/runner/work/quarkus/quarkus/core/deployment/src/main/java/io/quarkus/deployment/ExtensionLoader.java

[quarkus-bot]

Failing Jobs - Building ad6b2d5

Status	Name	Step	Failures	Logs	Raw logs
✖	Gradle Tests - JDK 11 Windows	Build	Failures	Logs	Raw logs
✖	JVM Tests - JDK 11	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 17

Full information is available in the Build summary check run.

Failures

⚙️ Gradle Tests - JDK 11 Windows #

- Failing: integration-tests/gradle 

📦 integration-tests/gradle

✖ io.quarkus.gradle.devmode.QuarkusDevDependencyDevModeTest.main line 14 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.test.devmode.util.DevModeTestUtils that uses java.util.function.Supplier, java.util.function.Supplierjava.util.concurrent.atomic.AtomicReference, java.util.concurrent.atomic.AtomicReferencejava.lang.String, java.lang.Stringboolean was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:164)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

---

⚙️ JVM Tests - JDK 11 #

- Failing: integration-tests/container-image/maven-invoker-way 

📦 integration-tests/container-image/maven-invoker-way

✖ Failed to execute goal org.apache.maven.plugins:maven-invoker-plugin:3.2.2:run (integration-tests) on project quarkus-integration-test-container-image-invoker: 1 build failed. See console output above for details.

📦 integration-tests/container-image/maven-invoker-way/target/it/container-build-jib-with-kafka

✖ org.acme.kafka.KafkaClientIT.testBareClients - More details - Source on GitHub

java.lang.RuntimeException: 
java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.kafka.client.deployment.DevServicesKafkaProcessor#startKafkaDevService threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed

✖ org.acme.kafka.KafkaClientIT.testBareClients - More details - Source on GitHub

java.lang.RuntimeException: 
java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.kafka.client.deployment.DevServicesKafkaProcessor#startKafkaDevService threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed