refactor: update levy median implementation

[thedeeppp]

Resolves #5902.

Description

• Replace randu with random/base/uniform in benchmark files
• Update test messages to be more descriptive
• Maintain consistent code style across packages

This pull request:

Changes:

• Use uniform() from @stdlib/random/base/uniform for random number generation
• Update test messages from 'returns NaN' to 'returns expected value'
• Improve code consistency with other distribution packages

What is the purpose of this pull request?

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves Address commit comments (commit b790b70) #5902

Questions

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No.

Other

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No.

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• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/levy/median	$\color{green}182/182$ $\color{green}+100.00\%$	$\color{green}9/9$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}182/182$ $\color{green}+100.00\%$
stats/base/dists/triangular/logcdf	$\color{green}356/356$ $\color{green}+100.00\%$	$\color{green}36/36$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}356/356$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.