feat: wire Hibernate 5 adapter to GormRegistry O(M+N) scaling

[borinquenkid]

Summary

Wires the Hibernate 5 adapter into the GormRegistry introduced in #15780.

• HibernateGormApiFactory — new factory that creates HibernateGormStaticApi, HibernateGormInstanceApi, and HibernateGormValidationApi instances typed to HibernateDatastore
• HibernateGormEnhancer.registerConstraints() — registers HibernateGormApiFactory with GormRegistry so Hibernate-typed APIs are used for all H5 entities
• GrailsDataHibernate5TckManager — updated to participate in the registry lifecycle
• TenantBoundHibernateTemplate — new template subclass that binds the current tenant to the Hibernate session for DISCRIMINATOR multi-tenancy
• Unit tests: HibernateGormApiFactorySpec, GormRegistryScalabilitySpec, Hibernate5TenantContextProfilingSpec

Test plan

• ./gradlew :grails-data-hibernate5:test passes
• TCK suite passes with -Phibernate5.gorm.suite

Stack

• Prereq: (1/3) feat: add SessionResolver infrastructure and extend core datastore APIs #15779 → (2/3) feat: GORM O(M+N) scaling — GormRegistry, GormEnhancer, and core API refactor #15780 → test: add unit and TCK tests for GormRegistry O(M+N) scaling #15781
• This PR — Hibernate 5 wiring
• Next: feat/gorm-registry-mongodb

🤖 Generated with Claude Code

[testlens-app]

✅ All tests passed ✅

🏷️ Commit: bde6eff
▶️ Tests: 1657 executed
⚪️ Checks: 39/39 completed

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[borinquenkid]

Superseded by #15780 — the consolidated GormRegistry core-impl PR wires the in-build adapters directly (Hibernate 5/7 and MongoDB via a registered GormApiFactory; SimpleMap and GraphQL via the base GormStaticApi) and is stabilized green. The unique unit-test coverage from this stack was harvested into #15790. Closing as superseded; the branch is retained for reference (not deleted).