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 math/base/special/floorb and math/base/special/floorn packages.
• Replaces randu() with 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.

---

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/floorb	$203/203$ $+100.00\mathrm{\%}$	$24/24$ $+100.00\mathrm{\%}$	$2/2$ $+100.00\mathrm{\%}$	$203/203$ $+100.00\mathrm{\%}$
math/base/special/floorn	$272/272$ $+100.00\mathrm{\%}$	$24/24$ $+100.00\mathrm{\%}$	$2/2$ $+100.00\mathrm{\%}$	$272/272$ $+100.00\mathrm{\%}$

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

[Planeshifter]

LGTM! Thanks!

[stdlib-bot]

PR Commit Message

bench: update random value generation

PR-URL: https://github.com/stdlib-js/stdlib/pull/6204

Co-authored-by: hrshya <harshyadav6078@gmail.com>
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

Please review the above commit message and make any necessary adjustments.