Use Hibernate Reactive's persistAll in Panache

[geoand]

The one thing I am not sure of is that when using this, we are not checking if the session contains each entity as the simple persist method does (and as the previous - erroneous - implementation implicitly did)

Fixes: #21772

[geoand]

cc @DavideD

[Sanne]

Looks good, thanks.

In general I would consider it an error to attempt to persist and object which is in the session already; I'm not sure why the existing persist method is lenient about it. @FroMage ?

[geoand]

In general I would consider it an error to attempt to persist and object which is in the session already;

I agree, but I thought I would bring it up with you folks to get an expert opinion

[Sanne]

I'm wondering also why a "persist(Stream)" is exposed, that might confuse people leading them to have the wrong idea about memory requirements of this operation.

[geoand]

I agree on that also. I didn't want to change anything on that front however, since I don't have the context of why it was exposed in the first place

[Sanne]

@geoand sure - let's treat those as unrelated changes and wait for @FroMage 's opinion. (This PR looks good as-is)