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/normal/ packages.
• Replaces uniform() from @stdlib/random/array/uniform for cleaner and more consistent code.
• Moves the random number generation outside the benchmarking loops.
• Refactors to use string interpolation.

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

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

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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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/normal/cdf	$\color{green}299/299$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}299/299$ $\color{green}+0.00%$
stats/base/dists/normal/ctor	$\color{green}487/487$ $\color{green}+0.00%$	$\color{green}36/36$ $\color{green}+0.00%$	$\color{green}19/19$ $\color{green}+0.00%$	$\color{green}487/487$ $\color{green}+0.00%$
stats/base/dists/normal/entropy	$\color{green}178/178$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}178/178$ $\color{green}+0.00%$
stats/base/dists/normal/kurtosis	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/logcdf	$\color{green}325/325$ $\color{green}+0.00%$	$\color{green}27/27$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}325/325$ $\color{green}+0.00%$
stats/base/dists/normal/logpdf	$\color{green}312/312$ $\color{green}+0.00%$	$\color{green}23/23$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}312/312$ $\color{green}+0.00%$
stats/base/dists/normal/mean	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/median	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/mgf	$\color{green}293/293$ $\color{green}+0.00%$	$\color{green}19/19$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}293/293$ $\color{green}+0.00%$
stats/base/dists/normal/mode	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/pdf	$\color{green}316/316$ $\color{green}+0.00%$	$\color{green}25/25$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}316/316$ $\color{green}+0.00%$
stats/base/dists/normal/quantile	$\color{green}306/306$ $\color{green}+0.00%$	$\color{green}27/27$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}306/306$ $\color{green}+0.00%$
stats/base/dists/normal/skewness	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/stdev	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$
stats/base/dists/normal/variance	$\color{green}175/175$ $\color{green}+0.00%$	$\color{green}9/9$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}175/175$ $\color{green}+0.00%$

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