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 42.68%. Comparing base (9fc5b39) to head (4574778).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4977   +/-   ##
=========================================
  Coverage     42.68%   42.68%           
  Complexity     2183     2183           
=========================================
  Files          1031     1031           
  Lines         38110    38110           
  Branches       4004     4004           
=========================================
  Hits          16269    16269           
  Misses        20824    20824           
  Partials       1017     1017           

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)		Carriedforward from 9fc5b39
amber	43.15% <ø> (ø)		Carriedforward from 9fc5b39
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	33.24% <ø> (ø)
frontend	33.00% <ø> (ø)		Carriedforward from 9fc5b39
python	88.90% <ø> (ø)		Carriedforward from 9fc5b39
workflow-compiling-service	47.72% <ø> (ø)

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

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