fix: Duplicate JSONToMap in JSONUtils and JSONUtil

[Ma77Ball]

What changes were proposed in this PR?

JSONToMap was duplicated byte-for-byte in JSONUtils.scala (workflow-core) and JSONUtil.scala (workflow-operator). Deleted the workflow-operator copy and updated JSONLScanSourceOpExec to import from JSONUtils.

Any related issues, documentation, discussions?

closes: #4813

How was this PR tested?

Existing JSONLScanSourceOpExec tests. No behavior change

Was this PR authored or co-authored using generative AI tooling?

Co-authored by Claude Opus 4.7 in compliance with ASF

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.14%. Comparing base (b9bbf0d) to head (6f4fea1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4977      +/-   ##
============================================
- Coverage     42.71%   42.14%   -0.58%     
  Complexity     2185     2185              
============================================
  Files          1032      980      -52     
  Lines         38161    36261    -1900     
  Branches       4006     3787     -219     
============================================
- Hits          16301    15282    -1019     
+ Misses        20840    20045     -795     
+ Partials       1020      934      -86     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)		Carriedforward from ea6607e
amber	43.21% <ø> (+0.03%)	⬆️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	30.52% <ø> (-2.57%)	⬇️	Carriedforward from ea6607e
python	87.57% <ø> (-1.33%)	⬇️	Carriedforward from ea6607e
workflow-compiling-service	47.72% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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