bench: refactor to use string interpolation in blas/ext/base/dsumkbn2

[rautelaKamal]

Ref: #8647.

Description

What is the purpose of this pull request?

This pull request:

• Refactors the JavaScript benchmarks in @stdlib/blas/ext/base/dsumkbn2 to use string interpolation (@stdlib/string/format) for generating benchmark names instead of string concatenation, as outlined in the tracking issue #8647.

Related Issues

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This pull request has the following related issues:

• #8647

Questions

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No.

Other

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No.

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dsumkbn2	$\color{red}416/419$ $\color{green}+99.28%$	$\color{red}31/32$ $\color{green}+96.88%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{red}416/419$ $\color{green}+99.28%$

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