Fix flaky GetTransactionLifecycleTest caused by slow CI

[famod]

Fixes e.g.:

[INFO] Running io.quarkus.hibernate.orm.transaction.GetTransactionLifecycleTest
2021-09-12 22:20:01,773 WARN  [io.qua.net.run.NettyRecorder] (Thread-2169) Netty DefaultChannelId initialization (with io.netty.machineId system property set to 3e:4c:c3:3e:ed:0f:72:6a) took more than a second
2021-09-12 22:20:07,284 INFO  [io.quarkus] (main) Quarkus 999-SNAPSHOT on JVM started in 7.521s. Listening on: http://localhost:8081
2021-09-12 22:20:07,284 INFO  [io.quarkus] (main) Profile test activated. 
2021-09-12 22:20:07,284 INFO  [io.quarkus] (main) Installed features: [agroal, cdi, hibernate-orm, hibernate-validator, jdbc-h2, narayana-jta, smallrye-context-propagation, smallrye-metrics, vertx]
2021-09-12 22:20:07,663 INFO  [io.quarkus] (main) Quarkus stopped in 0.039s
[ERROR] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 8.581 s <<< FAILURE! - in io.quarkus.hibernate.orm.transaction.GetTransactionLifecycleTest
[ERROR] io.quarkus.hibernate.orm.transaction.GetTransactionLifecycleTest  Time elapsed: 8.581 s  <<< FAILURE!
java.lang.AssertionError: 

Expecting empty but was: ["Netty DefaultChannelId initialization (with io.netty.machineId system property set to 3e:4c:c3:3e:ed:0f:72:6a) took more than a second"]
	at io.quarkus.hibernate.orm.transaction.AbstractTransactionLifecycleTest.lambda$static$2(AbstractTransactionLifecycleTest.java:55)

#20080 (comment)

First I thought about removing the warning altogether:

quarkus/extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/NettyRecorder.java

Lines 17 to 36 in 2cbd177

	// TODO: Remove this method (maybe in 1.6.x of Quarkus or later) if there are no user reports
	// of the WARN message issued from this method. See comments in https://github.com/quarkusio/quarkus/pull/9246
	// for details
	public void eagerlyInitChannelId() {
	//this class is slow to init and can block the IO thread and cause a warning
	//we init it from a throwaway thread to stop this
	//we do it from another thread so as not to affect start time
	new Thread(new Runnable() {
	@Override
	public void run() {
	long start = System.currentTimeMillis();
	DefaultChannelId.newInstance();
	if (System.currentTimeMillis() - start > 1000) {
	log.warn("Netty DefaultChannelId initialization (with io.netty.machineId" +
	" system property set to " + System.getProperty("io.netty.machineId")
	+ ") took more than a second");
	}
	}
	}).start();
	}

but we do see user logs with that from time to time:

• https://github.com/quarkusio/quarkus/issues?q=is%3Aissue+Netty+DefaultChannelId+initialization
• https://quarkusio.zulipchat.com/#narrow/search/netty.20defaultchannelid.20initialization