bench: refactor to use string interpolation in `number/uint32/base/mul`

[opbot-xd]

Progresses a part of #8647.

Description

What is the purpose of this pull request?

This pull request:

• Refactors JavaScript benchmarks in number/uint32/base/mul to use string interpolation via @stdlib/string/format instead of string concatenation when specifying benchmark names
• Adds @stdlib/string/format import to two benchmark files: benchmark.js and benchmark.native.js
• Replaces string concatenation patterns (pkg+'::inline', pkg+'::native') with format function calls using appropriate format specifiers

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #8647

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.

All benchmarks were tested locally using:

make benchmark BENCHMARKS_FILTER=".*/number/uint32/base/mul/.*"

Checklist

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

• [x] Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• [ ] Yes
• [x] No

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
number/uint32/base/mul	$\color{green}227/227$ $\color{green}+100.00%$	$\color{green}5/5$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}227/227$ $\color{green}+100.00%$

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