fix(OrganizationChart): prevent duplicate child rows when chunking

[vaibavdk-pieq]

Fixes #8540

Defect Fixes

When a node has more than MAX_CHILDREN_PER_ROW (10) children, createChildrenSection() chunks children into rows, but createLinesDown(), createLinesMiddle(), and createChildNodes() each re-chunked all children and rendered every row on each iteration. That duplicated the full child subtree once per chunk (e.g. 16 children appeared twice).

This PR updates those helpers to render only the row slice passed from createChildrenSection(), so each child is rendered once across chunked rows.

Summary

• Remove redundant chunkArray / rows.map from createLinesDown, createLinesMiddle, and createChildNodes.
• Keep chunking logic solely in createChildrenSection().

Test plan

• Open OrganizationChart with a node that has 11+ expanded children (e.g. 16).
• Confirm each child appears once in the UI/DOM (no duplication per chunk).
• Confirm connector lines still align correctly for multi-row layouts.
• Regression: nodes with ≤10 children render as before.