bench: refactor to use string interpolation in mathjs

[AyushiJain18270]

Resolves #{{a part of #8647}}.

Description

What is the purpose of this pull request?

Refactors the JavaScript benchmarks in docs/migration-guides/mathjs/benchmark/benchmark.subtract.js to replace string concatenation with @stdlib/string/format for benchmark names.
Improves readability, consistency, and allows future linting of benchmark names.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• a part of [RFC]: use string interpolation in JavaScript benchmarks for the benchmark name (tracking issue) #8647

Questions

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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.

AI Assistance

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

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• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

NOT applicable. no AI used.

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@stdlib-js/reviewers

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[kgryte]

LGTM

[kgryte]

As the CI failure is not due to changes introduced in this PR, I'll go ahead and merge.

[kgryte]

Thank you for your contribution and congratulations on your first PR!