CI: detect-changes workflow to only check the affected components on the CI side

[alwx]

Fixes #5786
Fixes #5785

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

.github/workflows/detect-changes.yml — New reusable workflow that uses dorny/paths-filterv3 with the file filters to produce needs_ios and needs_android boolean outputs.

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

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• CI: detect-changes workflow to only check the affected components on the CI side by alwx in #5843

• fix(tracing): Skip native frames and stall tracking for unsampled spans by antonis in #5842

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