chore: user-agent reports extension version instead of vscode version

[DevonL]

• Chore: user-agent reports extension version instead of vscode version

📄 Summary

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🔍 Related Issues

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🧪 Type of Change

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• [FIX] Bug fix
• [NEW] New thing
• [REFACTOR] Internal changes such as code restructuring or optimization that does not alter functionality
• [DOC] Documentation-only changes
• [CHORE] Maintenance, cleanup, or CI configuration

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✅ Checklist

• I’ve read and followed the CONTRIBUTING.md.
• I’ve added or updated documentation as needed.
• I’ve verified the change is tested and works as intended.
• CI/CD checks pass and do not break existing functionality.
• My code follows the style guidelines of this project.

[Copilot]

Pull request overview

This is a maintenance PR that refactors the user-agent string construction in the CloudsmithAPI module. The changes improve code organization by extracting the extension version and constructing the user-agent string at module initialization time, rather than loading the entire package.json object and constructing the string inline on each request.

Changes:

• Extract just the version from package.json instead of loading the entire object
• Create a module-level constant for the user-agent string
• Use the new constant when setting the User-Agent header

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