Support multi-select refdata properties in License term filter builder

Purpose:
To enable an ERM librarian to search for licenses that have specific values set for terms with multi-select refdata type

User story statement(s):

As a ERM librarian
I want to search for licenses that have specific values in a term with the multi-select pick list type
so that I can find licenses with particular values (or combination of values) for the term

Scenarios:

1. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type
   • Then I see the following options in the "Comparator" dropdown
     • Is set
     • Is not set
     • Contains
     • Does not contain
2. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type and have chosen "Contains" or "Does not contain" as the comparator
   • Then I see the option to select a single value from the pick list configured for that term
3. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type and have chosen "Contains" as the comparator, select a value and apply the search
   • Then the results set includes licenses where the term contains that value as one of the values in the multi-select term
4. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type and have chosen "Does not contain" as the comparator, select a value and apply the search
   • Then the results set includes licenses where the term does not contain that value as one of the values in the multi-select term
5. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type and have chosen "Is set" as the comparator and apply the search
   • Then the results set includes licenses where there is a value for that term
6. Scenario:
   • Given Licenses module Terms filter builder
   • When I select a term with the multi-select pick list type and have chosen "Is not set" as the comparator and apply the search
   • Then the results set includes licenses where there is not a value for that term

This is very similar behaviour to the existing filter builder behaviour for pick list terms but with the comparators "Contains" and "Does not contain" replacing "Is" and "Is not" due to the term being able to contain multiple values. Note that there is no need for the user to specify multiple values in a single search comparator, as they can use the filter build to do both OR and AND operations for the term