bench: refactor to use string interpolation in blas/ext/base/dcusum

[rautelaKamal]

Ref #8647

Description

What is the purpose of this pull request?

This pull request:

• Refactors the JavaScript benchmarks in @stdlib/blas/ext/base/dcusum to use string interpolation via @stdlib/string/format instead of string concatenation for constructing benchmark names.

Related Issues

This pull request resolves a part of #8647.

Checklist

• Read, understood, and followed the contributing guidelines
• Updated JavaScript benchmarks to use @stdlib/string/format.
• Verified benchmark names are preserved after refactoring.

[stdlib-bot]

Hello! Thank you for your contribution to stdlib.

We noticed that the contributing guidelines acknowledgment is missing from your pull request. Here's what you need to do:

1. Please read our contributing guidelines.

2. Update your pull request description to include this checked box:

   - [x] Read, understood, and followed the [contributing guidelines](https://github.com/stdlib-js/stdlib/blob/develop/CONTRIBUTING.md)

This acknowledgment confirms that you've read the guidelines, which include:

• The developer's certificate of origin
• Your agreement to license your contributions under the project's terms

We can't review or accept contributions without this acknowledgment.

Thank you for your understanding and cooperation. We look forward to reviewing your contribution!

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dcusum	$\color{green}367/367$ $\color{green}+100.00%$	$\color{green}13/13$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}367/367$ $\color{green}+100.00%$

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

[stdlib-bot]

PR Commit Message

bench: refactor to use string interpolation in `blas/ext/base/dcusum`

PR-URL: https://github.com/stdlib-js/stdlib/pull/10532
Ref: https://github.com/stdlib-js/stdlib/issues/8647

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

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

⚠️ Action Required: This PR references tracking issues. Please update the PR description to replace any "Closes", "Fixes", or "Resolves" keywords with "Ref" when referencing these issues.