Tolerate junit-platform.properties in user code

[holly-cummins]

Resolves #47646

Most JUnit listeners can use the service loading mechanism, without needing a junit-platform.properties change. The one exception is a LauncherInterceptor. That's what the new code uses to inject a TCCL. However, after #47365, the 'main' TCCL-injecting happens using a discovery listener. There's also an adjustment that happens earlier, to support gradle (which doesn't load tests in the discovery phase). However, that adjustment doesn't need to be done using an interceptor, and it can use a normal session listener instead.

With this change, there are now two session listeners, one in junit5 and one in junit5-config. I looked into consolidating them, but that doesn't work, because some projects use only junit5-config. I've confirmed that the two listeners should work as expected, no matter which order they're invoked in.

This PR doesn't fix all problems that can be caused by user junit-platform.properties, just the most acute one. See #48125 for a discussion of the others.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 6dea9ab.

Failing Jobs

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✖	JVM Integration Tests - JDK 17	Build	Failures	Logs	Raw logs	🔍
✔️	JVM Integration Tests - JDK 17 Windows			Logs	Raw logs	🔍
✔️	JVM Integration Tests - JDK 21			Logs	Raw logs	🔍

Full information is available in the Build summary check run.
You can consult the Develocity build scans.

Failures

⚙️ JVM Integration Tests - JDK 17 #

- Failing: integration-tests/opentelemetry-grpc-only 

📦 integration-tests/opentelemetry-grpc-only

✖ io.quarkus.it.opentelemetry.grpc.HelloGrpcClientTest.testHello - History - More details - Source on GitHub

java.lang.RuntimeException: java.lang.RuntimeException: Failed to start quarkus
	at io.quarkus.test.junit.QuarkusTestExtension.throwBootFailureException(QuarkusTestExtension.java:668)
	at io.quarkus.test.junit.QuarkusTestExtension.interceptTestClassConstructor(QuarkusTestExtension.java:763)
	at java.base/java.util.Optional.orElseGet(Optional.java:364)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
Caused by: java.lang.RuntimeException: Failed to start quarkus
	at io.quarkus.runner.ApplicationImpl.doStart(Unknown Source)

[geoand]

Seems reasonable but maybe @radcortez also wants to take a look