Properly close the worker executor in Quarkus messaging

[cescoffier]

No description provided.

[quarkus-bot]

Thanks for your pull request!

Your pull request does not follow our editorial rules. Could you have a look?

• description should not be empty, describe your intent or provide links to the issues this PR is fixing (using Fixes #NNNNN) or changelogs

_{This message is automatically generated by a bot.}

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 1049c90.

✅ 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.

You can consult the Develocity build scans.