bench: refactor to use dynamic memory allocation in blas/ext/base/dnancusumkbn

[SijanBhandari17]

Resolves a part of #8643

Description

What is the purpose of this pull request?

This pull request:

• This pull request changes the static implementation of C benchmark in blas/ext/base/dnancusumkbn with Dynamic Memory Allocation

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: replace static memory allocation of large arrays in C benchmarks with dynamic memory allocation (tracking issue) #8643

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dcusumkbn	$\color{green}428/428$ $color{green}+100.00%$	$\color{green}25/25$ $color{green}+100.00%$	$\color{green}4/4$ $color{green}+100.00%$	$\color{green}428/428$ $color{green}+100.00%$
blas/ext/base/dnancusumkbn	$\color{green}433/433$ $color{green}+100.00%$	$\color{green}31/31$ $color{green}+100.00%$	$\color{green}4/4$ $color{green}+100.00%$	$\color{green}433/433$ $color{green}+100.00%$

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

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