QuarkusComponentTest: convenient handling of nested classes

[mkouba]

• add static nested classes declared on test class to the set of components under test by default
• exclude static nested classes declated on a QuarkusComponentTest from discovery during @QuarkusTest

[mkouba]

This PR partially solves #34086.

[Ladicek]

LGTM otherwise.

[quarkus-bot]

Failing Jobs - Building f651231

Status	Name	Step	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 11
✔️	JVM Tests - JDK 17
✖	JVM Tests - JDK 17 Windows	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 19
✔️	Maven Tests - JDK 11
⌛	Maven Tests - JDK 11 Windows	Build	⚠️ Check →	Logs	Raw logs
✖	Native Tests - Windows - RESTEasy Jackson	Setup GraalVM	⚠️ Check →	Logs	Raw logs

Full information is available in the Build summary check run.

Failures

⚙️ JVM Tests - JDK 17 Windows #

- Failing: extensions/vertx/deployment 
! Skipped: extensions/agroal/deployment extensions/amazon-lambda-http/deployment extensions/amazon-lambda-rest/deployment and 365 more

📦 extensions/scheduler/deployment

✖ io.quarkus.scheduler.test.PausedSchedulerTest.testSchedulerPauseResume line 47 - More details - Source on GitHub

org.opentest4j.AssertionFailedError: expected: <false> but was: <true>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)

📦 extensions/vertx/deployment

✖ io.quarkus.vertx.mdc.VertxMDCTest.mdc line 144 - More details - Source on GitHub

org.opentest4j.AssertionFailedError: expected: <10> but was: <0>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)

✖ io.quarkus.vertx.mdc.VertxMDCTest.mdcNonVertxThreadTest line 121 - More details - Source on GitHub

java.lang.AssertionError: 

Expected: a collection containing "Test MDC value ### Test 1"