bench: refactor to use string interpolation in ndarray/base/assign

[parthodas23]

Progresses #8647 .

Description

What is the purpose of this pull request?

This pull request:

• bench: refactor to use string interpolation in ndarray/base/assign

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [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

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

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

{{TODO: add disclosure if applicable}}

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Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/base/assign	$\color{red}4690/10532$ $\color{green}+44.53%$	$\color{green}44/44$ $\color{green}+100.00%$	$\color{red}0/45$ $\color{green}+0.00%$	$\color{red}4690/10532$ $\color{green}+44.53%$

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