Cannot add multiple enum values when enum has multi-cardinality

## Bug Report

### Steps to Reproduce:
1. Navigate to an enum with multiple cardinality in the Object Builder
`LegalAgreement -> agreementTerms -> agreement -> creditSupportAgreementElections -> conditionsPrecedent -> specifiedCondition -> partyElection -> specifiedCondition`
3. Try and add more than 1 value

### Expected Result:
There should be some mechanism to add multiple values in an enum with multiple cardinality

For multiple cardinality enums, you should be able to add multiple using an add button, or repeating the tile in the object builder.

### Actual Result:
Only 1 value can be selected from the dropdown.

### Environment:
CDM-JAVA7.0.0-dev.37

Start by reproducing the issue in the Object Builder using the LegalAgreement path described in the report, then trace the enum field's cardinality and selection UI. Done means a multi-cardinality enum can accept more than one value through an add control or repeated tile, while single-cardinality behavior remains unchanged.

Written by the indexing model from the issue text.