remove workaround and implmement update of entity with IdClass

[njr-11]

This PR removes the workarounds for 28925 and adds implementation of various update and update-and-retrieve scenarios, involving IdClass with or without version. It also covers updates with association attributes, which were not working.

• 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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[njr-11]

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