entity with multiple of same embedded type

[njr-11]

Received confirmation from the JPA team that EclipseLink does not intend to support multiple of the same embedded type under and entity without overrides, despite the unusual error that we see out of EclipseLink running invalid SQL against the database rather than raising an appropriate message for unsupported. The JPA team will look into improving that on the EclipseLink side. This PR will make the workaround of using attribute overrides official in the test because that is considered by EclipseLink to be the required way to do it, not a workaround.

Adding fixes #29459 to make github close that issue upon closing this PR.

• I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify release bug label if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).
• If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".

[njr-11]

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