Add MultiSelect for list conditions on enum attributes

[Kevin-Chant]

Features and Changes

Changes the ConditionInput logic to use a MultiSelectField when using a list operator on an enum field.

• Closes [Feature] Improve the enum value checks in feature conditions #3180

Testing

• Checked that the UX works correctly (typeahead, enter to select, doesn't allow a value outside of the enum) in simple mode
• If an invalid value is entered in advanced mode, handles it gracefully (allows it to exist but doesn't render in simple mode. If updated in simple, the invalid value is purged)

Screenshots