HHH-14080 Informix union all support

[VladoKuruc]

All *UnionSubclassTest tests pass locally

[gavinking]

This looks fine to me though I can't test it because I don't have Informix. The change would need to be replicated to H6.

[hibernate-github-bot[bot]]

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[VladoKuruc]

I closed this pull request because I created a new one #8027 based on the current version in the main branch.