HHH-19940 Make sure that the maven plugin is included in the staging dir for releases

[marko-bekhta]

https://hibernate.atlassian.net/browse/HHH-19940

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[marko-bekhta]

hey @sebersole 🙂

when @dreab8 and I were looking into it we didn't see any reasons not to switch to local.publishing-java-module in the maven plugin module (now that publishing mostly means staging the artifacts in the correct local directory), but maybe there was a reason that we should keep the distinction.

[sebersole]

I think that's totally fine