gammaray: exclude qtwebengine on arm64 linux

[cho-m]

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[Copilot]

Pull Request Overview

This PR updates the GammaRay formula to conditionally exclude the qtwebengine dependency on arm64 Linux systems. The change addresses a bottling issue where qtwebengine is not yet available for arm64 Linux architecture.

Key Changes:

• Refactored qtwebengine dependency conditions to be architecture-specific on Linux
• Added a TODO comment indicating the temporary nature of this exclusion

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