[JS] Fix context extraction: skip arrow functions in object properties

[mohammedahmed18]

Summary

• Skip arrow functions that are object properties (e.g., { foo: () => {} }) when extracting helper functions
• These are values in object literals, not standalone functions
• Previously, object property arrow functions were incorrectly extracted as "helper functions", causing invalid floating code in the output

Problem

When a function references dependencies.getSlackChannelId(), the extractor was finding the arrow function property:

let dependencies = {
  getSlackChannelId: () => process.env.SLACK_CHANNEL_ID,
}

And extracting just the property line, resulting in invalid syntax:

  getSlackChannelId: () => process.env.SLACK_CHANNEL_ID,

Fix

Added a check in _walk_tree_for_functions() to skip arrow functions whose parent is a pair node (object property).

Test plan

• Added test test_with_tricky_helpers with full string assertion
• All 598 language tests pass

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