workarounds for selecting ElementCollection attributes

[njr-11]

EclipseLink has wrong behavior when ElementCollection attributes are selected, as shown by #30575
This PR puts in place the following workarounds, to the degree that we are able,

When a single result of a selected ElementCollection is returned, we can sometimes implement a workaround to identify the mismatch and generate the correct type of collection, populated with the results.

When multiple results of a selected ElementCollection are returned, EclipseLink combines the values into a single vector where it is impossible to split them back out into the separate results that they are. We attempt to detect this scenario and raise our own UnsupportedOperationException in order to spare the user from unexpected wrong behavior.

There are also some improvements in this area to type conversions.

• 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]

#build (view Open Liberty Personal Build - ❌ completed with errors/failures.)

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[KyleAure]

Database Rotation SOE for this PR: https://libh-proxy1.fyre.ibm.com/cognitive-dev/pipelineAnalysis.html?pipelineId=24ac3a31-414e-4ba4-825c-bcf390c9866e

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[njr-11]

@is273 thank you for reviewing the messages. All of the updates you asked for are included in a363dac
Please add your approval once you confirm.

[njr-11]

New build needed due to additional commit with NLS message updates:
(view Open Liberty Personal Build - ❌ completed with errors/failures.)
#build
The other build for database rotation should still be fine because NLS updates don't make difference to what is being covered there.

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  • dev/io.openliberty.data.internal.persistence/resources/io/openliberty/data/internal/persistence/resources/CWWKDMessages.nlsprops

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[njr-11]

New build needed due to additional commit with NLS message updates: (view Open Liberty Personal Build - ❌ completed with errors/failures.) #build The other build for database rotation should still be fine because NLS updates don't make difference to what is being covered there.
(view Open Liberty Personal Build - ❌ completed with errors/failures.)

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The build has 1 failure, which is a preexisting intermittent issue in unrelated test bucket com.ibm.ws.jbatch.rest.api_fat

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  • dev/io.openliberty.data.internal.persistence/resources/io/openliberty/data/internal/persistence/resources/CWWKDMessages.nlsprops

• 1 NLS files were changed and need an ID review.

• @OpenLiberty/message-reviewer Please review.

  • dev/io.openliberty.data.internal.persistence/resources/io/openliberty/data/internal/persistence/resources/CWWKDMessages.nlsprops