WPCS improvement

[mrmakadia94]

Summary

Fixes #

Relevant technical choices

• use unslashed and sanitization for $_GET['file']
• use $plugin_data['requires'] ?? null to reduce cognitive load.

[github-actions]

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Co-authored-by: mrmakadia94 <immeet94@git.wordpress.org>
Co-authored-by: mukeshpanchal27 <mukesh27@git.wordpress.org>
Co-authored-by: westonruter <westonruter@git.wordpress.org>

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[mukeshpanchal27]

Thanks for the PR, @mrmakadia94. The changes you proposed seem redundant. Please review my feedback.

[westonruter]

Thanks!