fix: Add multivariate values when cloning identities

[novakzaballa]

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Changes

Change the clone identities endpoints in Core and Edge APIs to clone also multivariate values for overriden feature states having that configuration.

How did you test this code?

Unit tests updated to consider this case

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Name	Status	Preview	Comments	Updated (UTC)
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.87%. Comparing base (53e728a) to head (397d9b3).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3894    +/-   ##
========================================
  Coverage   95.87%   95.87%            
========================================
  Files        1133     1134     +1     
  Lines       35873    36035   +162     
========================================
+ Hits        34393    34549   +156     
- Misses       1480     1486     +6     

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