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

[ishwarthecodddr]

Progresses #8643

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---

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/ccopy	$\color{green}394/394$ $\color{green}+0.00%$	$\color{green}17/17$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}394/394$ $\color{green}+0.00%$

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