Fix AutoGeneratedTimestampRecordExtension failing on @DynamoDbConvertedBy list attributes

[alextwoods]

Motivation and Context

Fixes #6852

PR #6546 added nested record support to AutoGeneratedTimestampRecordExtension, which recursively introspects all attributes to find @DynamoDbAutoGeneratedTimestampAttribute fields in nested types. This introspection does not respect @DynamoDbConvertedBy on list attributes — it attempts to resolve a TableSchema for the list element type even when a custom converter already handles serialization.

If the list element class is not annotated with @DynamoDbBean or @DynamoDbImmutable, TableSchema.fromClass() throws IllegalArgumentException. This is a regression for any @DynamoDbBean that has both a @DynamoDbAutoGeneratedTimestampAttribute field and a List<T> field with @DynamoDbConvertedBy where T is not a DynamoDB-annotated class.

Modifications

In NestedRecordUtils.getTableSchemaForListElement(), before calling TableSchema.fromClass() on the list element type, check whether the class has @DynamoDbBean or @DynamoDbImmutable annotations. If neither is present, return null instead of throwing. The callers in AutoGeneratedTimestampRecordExtension already handle null by skipping introspection for that attribute.

Testing

• Added unit tests in NestedRecordUtilsTest verifying getTableSchemaForListElement returns null for non-annotated element types and that getListElementSchemaCached caches the null result.
• Added functional tests in AutoGeneratedTimestampExtensionTest verifying beforeWrite succeeds and correctly sets the auto-generated timestamp while leaving @DynamoDbConvertedBy list and map attributes unchanged.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
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• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[alextwoods]

@anasatirbasa - tagging you for review as well as author of #6546 (couldn't add you directly as a reviewer, so just tagging here)

[sonarqubecloud]

Quality Gate failed

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D Maintainability Rating on New Code (required ≥ A)

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[github-actions]

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