[3.16] Upgrade to Hibernate ORM 6.6.3.Final

[yrodiere]

Backport of #44391 to branch 3.16. We'll probably want it backported to 3.15 as well.

I switched to a more conservative behavior for bytecode enhancement in the last commit, especially because I'm not sure we want the failure in 3.15/3.16.
If you think we do want the failure, let me know and I'll drop the last commit.

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/cc @gsmet (hibernate-orm)

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[gsmet]

There won't be any new 3.16.

• 3.17 will be released next week - we backport there if needed (not sure if you need a different patch from the one in main? If not, just add the label to the initial PR)
• If patch doesn't apply cleanly on 3.15, then we need a specific PR, otherwise same, backport label is fine (except if you want CI coverage now)

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[gsmet]

I saw your comment in the other PR so basically, let's rebase this PR for 3.15.

[yrodiere]

Looks like GitHub doesn't want me to do the changes I need to do -- the web UI is stuck loading, and git push to this branch just hangs. Maybe a bug in GitHub, maybe some infra down, I don't know. I'll just open a new PR.

[yrodiere]

Superseded by #44703