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Support parallel/concurrent testing with JUnit #42296

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Description

Description

Ideally, Quarkus integration tests should be able to run concurrently in JUnit 5 by configuring:

junit.jupiter.execution.parallel.enabled = true
junit.jupiter.execution.parallel.mode.default = concurrent

Doing this currently results in some sort race condition.
(in my limited testing this occurs about ~50% of the time, the rest of the time, my tests pass successfully.)

java.lang.RuntimeException: java.lang.IllegalStateException: SRCFG00017: Configuration already registered for the given class loader
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.throwBootFailureException(QuarkusIntegrationTestExtension.java:373)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.beforeEach(QuarkusIntegrationTestExtension.java:117)
  at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194)
  at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
  at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
  at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
  at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
  at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: java.lang.IllegalStateException: SRCFG00017: Configuration already registered for the given class loader
  at io.smallrye.config.SmallRyeConfigProviderResolver.registerConfig(SmallRyeConfigProviderResolver.java:120)
  at io.quarkus.runtime.configuration.QuarkusConfigFactory.setConfig(QuarkusConfigFactory.java:48)
  at io.quarkus.test.common.LauncherUtil.installAndGetSomeConfig(LauncherUtil.java:42)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.lambda$isCallbacksEnabledForIntegrationTests$1(QuarkusIntegrationTestExtension.java:381)
  at java.base/java.util.Optional.or(Optional.java:313)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.isCallbacksEnabledForIntegrationTests(QuarkusIntegrationTestExtension.java:381)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.doProcessStart(QuarkusIntegrationTestExtension.java:225)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.ensureStarted(QuarkusIntegrationTestExtension.java:169)
  at io.quarkus.test.junit.QuarkusIntegrationTestExtension.beforeAll(QuarkusIntegrationTestExtension.java:130)
  ... 6 more

Implementation ideas

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