Add comments to PRs when builds/tests fail and Develocity build scans are enabled

[yrodiere]

When a test fails, it can be helpful to add a comment to the PR to specify exactly what failed, with appropriate links.

When using the Develocity integration, we could possibly do it:

1. On the first failed build, we create a comment on the PR (see below for content) -- and include a hidden HTML marker (HTML comment) containing the commit hash this PR comment refers to.
2. On subsequent failed builds, we look for comments from the bot on the PR, and minimize those whose HTML marker refers a different (older) commit hash. If we find a PR comment containing the HTML marker for the current commit, we update that PR comment; if we don't find one, we create a new PR comment.

The content of the PR comment could take inspiration from what Guillaume did on Quarkus. But:

1. We'd want a single comment for all "workflows/jobs" (GitHub Actions/Jenkins)
2. The code from Quarkus is based on Maven Surefire output and cannot (easily) be reused for Gradle-based builds.
3. So I'd suggest to base all our data on Develocity metadata: I think the Develocity APIs allow us to list failing tests, so that would be a great start?

Something like the example below would be a start. Note the idea with the tests is to present, for each failed test, links to test failures as well as test successes, labelling both failures and tests with relevant Develocity Build Scan labels.

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3 builds failed

Job/Workflow	OS	Java	DB	Goals/Tasks	Results
Hibernate ORM build	Linux	17	sybase	check	🔴 ❌ 📃
Hibernate ORM build	Linux	17	mssql	check	🔴 ❌ 📃
Hibernate ORM build	Linux	17	mysql	check	🔴 ❌ 📃

12 builds succeeded

Job/Workflow	OS	Java	DB	Goals/Tasks	Results
Hibernate ORM build	Linux	17	hsqldb	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	h2	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	edb	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	pgsql	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	mariadb	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	oracle	check	🟢 ✅ 📃
Hibernate ORM build	Linux	17	db2	check	🟢 ✅ 📃
Hibernate ORM build-Atlas	Linux	21	oracle_cloud_autonomous	check	🟢 ✅ 📃
Hibernate ORM build-Atlas	Linux	21	oracle_cloud_db19c	check	🟢 ✅ 📃
Hibernate ORM build-Atlas	Linux	21	oracle_cloud_db23c	check	🟢 ✅ 📃
Hibernate ORM build-Atlas	Linux	21	oracle_cloud_db21c	check	🟢 ✅ 📃
hibernate-orm-pipeline/PR-8932	Linux	17	tidb	check	🟢 ✅ 📃

14 tests failed

:hibernate-core:test

Test		Failures ❌	Successes ✅
org.hibernate.orm.test.mapping.onetomany.OneToManyOrderedListJoinTableTest		jdk-17 sybase jdk-17 mssql jdk-17 mysql	jdk-17 hsqldb jdk-17 h2 jdk-21 h2 jdk-23 h2 jdk-17 edb
↳	testAddAtZeroDeleteAtTwo(SessionFactoryScope)	jdk-17 sybase jdk-17 mysql	jdk-17 mssql jdk-17 hsqldb jdk-17 h2 jdk-21 h2 jdk-23 h2 jdk-17 edb
↳	testNormalAddAndRemove(SessionFactoryScope)	jdk-17 mssql jdk-17 mysql	jdk-17 sybase jdk-17 hsqldb jdk-17 h2 jdk-21 h2 jdk-23 h2 jdk-17 edb
↳	testAddSameElementTwice(SessionFactoryScope)	jdk-17 sybase jdk-17 mssql jdk-17 mysql	jdk-17 hsqldb jdk-17 h2 jdk-21 h2 jdk-23 h2 jdk-17 edb