Add copy/CSV export buttons to benchmark results tables

[Copilot]

• Investigate existing results page (paper_results.rst) and DataTables setup
• Add DataTables Buttons extension CSS and JS (v3.0.2) to paper_results.rst
• Update DataTable initialization to include copy and CSV buttons via layout.topStart.buttons
• Run pre-commit checks on changed files (all pass)
• Add what's new entry in whats_new.rst attributed to Bruno Aristimunha

Original prompt

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This section details on the original issue you should resolve

<issue_title>DOC Create or make the copy buttom work to export results from the results webpage</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes DOC Create or make the copy buttom work to export results from the results webpage #571

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[bruAristimunha]

@copilot, pre-commit, and what's new file, please, assign Bruno Aristimunha to what's new. Check if the tests or documentation are failing.

[Copilot]

@copilot, pre-commit, and what's new file, please, assign Bruno Aristimunha to what's new. Check if the tests or documentation are failing.

Done in commit fb06e13:

• Pre-commit runs clean on all changed files (trailing whitespace, end-of-file, codespell, blacken-docs all pass).
• Added what's new entry to docs/source/whats_new.rst under Version 1.5 Enhancements, attributed to Bruno Aristimunha.