Handle control enum on json schema "items.enum"

[didoda]

This fixes a problem with json schema that uses enum in items.enum.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (bd0dd48) to head (c615779).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1354   +/-   ##
=========================================
  Coverage     99.77%   99.77%           
- Complexity     1504     1507    +3     
=========================================
  Files           102      102           
  Lines          5883     5885    +2     
=========================================
+ Hits           5870     5872    +2     
  Misses           13       13           

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