Helm chart: add CI tests for Eclipse Link

[adutra]

Description

Add more CI automated tests for the Helm chart, this time leveraging EclipseLink with H2.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation update
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [x] More tests for existing features

How Has This Been Tested?

In CI.

Checklist:

Please delete options that are not relevant.

• [x] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] If adding new functionality, I have discussed my implementation with the community using the linked GitHub issue

[ebyhr]

@adutra @snazy Could you confirm a CI failure on main branch? https://github.com/apache/polaris/actions/runs/11382155365/job/31665072150

[adutra]

@ebyhr this should fix it: #381