bench: refactor to use string interpolation in docs/migration-guides/jstat

[muskaanshraogi]

Resolves a part of #8647.

Description

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This pull request:

Refactors the JavaScript benchmark in docs/migration-guides/jstat to use @stdlib/string/format for string interpolation instead of string concatenation when specifying the benchmark name

Related Issues

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This pull request has the following related issues:

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

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