Use version-agnostic Hibernate presence check in QueryEnhancerFactory

[AurMario]

Hibernate 5.6 supports JPA 3.0, and should be usable with Spring Data JPA 3.1.x. Currently, only Hibernate 6 is detected and allows for the HQL Parser usage. This PR consists in enabling the HQL Parser in the case of Hibernate 5 too.

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[mp911de]

After upgrading to a new major version, we typically require the new baseline. We can support Hibernate 5.6 on a best-effort basis without actually guaranteeing that everything is working, as our tests use the JPA 3.1 baseline.

We're fine with this one change, however, we do not intent to put in more effort into downgrading compatibility.

[mp911de]

We've rewritten the presence detection for Spring Data JPA 3.2 already to a version-agnostic form and I polished up the pull request in the same direction. Can you also test whether the current 3.2 snapshots work with your Hibernate 5.6 arrangement?

[mp911de]

Thank you for your contribution. That's merged and polished now into the 3.1.x branch.