Move Hibernate-related Maven properties to root POM

[yrodiere]

... and automate version parsing for the documentation.

To avoid having to repeat the same version in various places, because
that leads to Yoann just forgetting about it and making a mess.

Based on #40956, which should be merged first.

[github-actions]

🙈 The PR is closed and the preview is expired.

[gsmet]

LGTM!

[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit ae97308.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

⚠️ There are other workflow runs running, you probably need to wait for their status before merging.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit ae97308.

Failing Jobs

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

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

Failures

⚙️ JVM Tests - JDK 21 #

- Failing: extensions/hibernate-orm/deployment 
! Skipped: extensions/flyway/deployment extensions/hibernate-envers/deployment extensions/hibernate-reactive/deployment and 88 more

📦 extensions/hibernate-orm/deployment

✖ io.quarkus.hibernate.orm.xml.hbm.HbmXmlQuarkusConfigTest. - History - More details - Source on GitHub

java.lang.RuntimeException: java.lang.RuntimeException: Failed to start quarkus
	at io.quarkus.test.QuarkusUnitTest.beforeAll(QuarkusUnitTest.java:708)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
Caused by: java.lang.RuntimeException: Failed to start quarkus
	at io.quarkus.runner.ApplicationImpl.doStart(Unknown Source)
	at io.quarkus.runtime.Application.start(Application.java:101)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at io.quarkus.runner.bootstrap.StartupActionImpl.run(StartupActionImpl.java:285)

[yrodiere]

The JDK 21 test failure is a flake (see quarkusio/quarkus-github-bot#452).

Root cause: java.lang.OutOfMemoryError: Metaspace :/

I don't see how this PR could possibly affect memory usage in tests, so I'd just merge?

And someone will have to look into QuarkusUnitTest memory leaks... again... It's not about dev mode this time, since we recently isolated dev mode tests in a different surefire execution.