fix: remove stringify for json type array initial value

[Jshhhh]

Issue #, if available:

Description of changes:

• Remove stringifying initial value for json type that isArray

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[codecov-commenter]

Codecov Report

Merging #753 (c2e4bc8) into main (d1744e0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #753   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files         102      102           
  Lines        4062     4062           
  Branches     1136     1136           
=======================================
  Hits         3715     3715           
  Misses        325      325           
  Partials       22       22           

Impacted Files	Coverage Δ
packages/codegen-ui-react/lib/forms/form-state.ts	98.41% <100.00%> (ø)

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