Remove JsonExpressionBuilder and JSON type tests

[Tigrov]

Related PR

• Refactor array, structured and JSON expressions. db#929

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️/❌
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.70%. Comparing base (bd8e8c2) to head (867e7f4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #376      +/-   ##
============================================
- Coverage     98.73%   98.70%   -0.03%     
+ Complexity      173      170       -3     
============================================
  Files            16       15       -1     
  Lines           552      541      -11     
============================================
- Hits            545      534      -11     
  Misses            7        7              

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