bench: update random value generation

[hrshya]

Resolves none .

Description

What is the purpose of this pull request?

This pull request:

• Refactors random number generation in JS benchmarks for the stats/base/dists/pareto-type1/* packages.
• Replaces uniform() from @stdlib/random/array/uniform for cleaner and more consistent code.
• Moves the random number generation outside the benchmarking loops.
• Updates the test messages to follow code conventions.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves no related issues.

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

---

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/pareto-type1/cdf	$\color{green}323/323$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}323/323$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/ctor	$\color{green}438/438$ $\color{green}+0.00%$	$\color{green}32/32$ $\color{green}+0.00%$	$\color{green}17/17$ $\color{green}+0.00%$	$\color{green}438/438$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/entropy	$\color{green}197/197$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}197/197$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/kurtosis	$\color{green}199/199$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}199/199$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/logcdf	$\color{green}327/327$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}327/327$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/logpdf	$\color{green}339/339$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}339/339$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/mean	$\color{green}181/181$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}181/181$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/median	$\color{green}119/119$ $\color{green}+0.00%$	$\color{green}6/6$ $\color{green}+0.00%$	$\color{green}1/1$ $\color{green}+0.00%$	$\color{green}119/119$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/mode	$\color{green}195/195$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}195/195$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/pdf	$\color{red}336/339$ $\color{green}+0.00%$	$\color{green}24/24$ $\color{green}+0.00%$	$\color{red}3/4$ $\color{green}+0.00%$	$\color{red}336/339$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/quantile	$\color{green}319/319$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}319/319$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/skewness	$\color{green}196/196$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}196/196$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/stdev	$\color{green}203/203$ $\color{green}+0.00%$	$\color{green}12/12$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}203/203$ $\color{green}+0.00%$
stats/base/dists/pareto-type1/variance	$\color{green}200/200$ $\color{green}+0.00%$	$\color{green}12/12$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}200/200$ $\color{green}+0.00%$

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