feat: add --no-color option for CLI output (#1091)

[jashwanth-reddy-g]

Fixes #1091

Description

This PR adds the requested --no-color flag to Trivy's global CLI options. When passed, it globally sets color.NoColor = true (via the fatih/color package) in the root pre-run hook, ensuring that all subsequent terminal output across all commands (image, fs, config, etc.) is rendered without ANSI color escape codes. This is useful for CI/CD pipelines or logging environments where raw text is preferred over styled text.

Testing

• Tested --no-color suppression against standard image scans.

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✅ jashwanth-reddy-g
❌ Jashwanth

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