Use the proper PU for executeUpdate on entityClass

[gsmet]

Fixes #42314
Introduced by #41547

[gsmet]

@marko-bekhta any chance you could add a test to the PR if it's not too convoluted to do it?

[gastaldi]

Good catch!

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit e3de691.

✅ 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.

[yrodiere]

Introduced by #41547

Sorry. That's indeed embarrassing.

[HerrDerb]

With now using an entity specific session, can this theoretically have a impact on memory and db connections for a complex transaction?

[yrodiere]

In short: no.

Because:

1. We didn't change the behavior here, we just reverted it to what it was before I introduced a regression by mistake.
2. We only use different sessions for different entities when you explicitly tell us to. See https://quarkus.io/guides/hibernate-orm#multiple-persistence-units