chore: Remove unnecessary script

[bthomee]

High Level Overview of Change

This change removes the script that was used to replace most include guards by #pragma once.

Context of Change

This script did part of the work but not all, and is unnecessary to have in the repo. It had not been intended to merge but was accidentally committed and merged.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

[Copilot]

Pull request overview

This PR removes a Python script that was accidentally committed and merged, which was used to convert C++ include guards to #pragma once directives. The script has served its purpose and is no longer needed in the repository.

Changes:

• Deletion of convert_include_guards.py, a utility script that converted include guards to #pragma once

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