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

[rautelaKamal]

Resolves a part of #8647.

Description

What is the purpose of this pull request?

This pull request:

• Refactors the JavaScript benchmarks in @stdlib/blas/ext/base/dapxsumpw 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

• Followed the contributing guidelines.
• Updated JavaScript benchmarks to use @stdlib/string/format.
• Verified benchmark names are preserved after refactoring.

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dapxsumpw	$\color{green}368/368$ $\color{green}+100.00%$	$\color{green}15/15$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}368/368$ $\color{green}+100.00%$

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