[Term Entry] Add Data Visualization in UX

[AnamolR]

Description

This PR adds a new UX and data design entry titled Data Visualization in UX to the uiux/concepts/ section.

New folder: content/uiux/concepts/data-visualization-in-ux/
Markdown file: data-visualization-in-ux.md introduces how UX principles apply to data visualization, outlines typical product contexts where visual data is used, shares core best practices for clarity and accessibility, and addresses user needs around visualized information.

The entry reinforces how effective data visualization supports decision-making, reduces cognitive load, and improves trust and usability in data-rich interfaces.

Type of Change

Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

Issues Solved

closes #6664