test: align skipped postgres test in 1.6

[albarbaro]

Description

These tests are skipped in main, but not in 1.6 and they are causing the same failure. Skipping here too until the bug is solved.

Which issue(s) does this PR fix

• Fixes RHDHBUGS-826

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

The image is available at:

• quay.io/rhdh-community/rhdh:pr-3086 or
• quay.io/rhdh-community/rhdh:pr-3086-c495358b

[openshift-merge-robot]

PR needs rebase.

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