[client] Add systemd netbird logs to debug bundle

[lixmal]

Describe your changes

Issue ticket number and link

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

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[Copilot]

Pull Request Overview

This PR enhances the debug bundle by adding support for collecting systemd journal logs. Key changes include:

• Adding trySystemdLogFallback functions for both Linux and non-Linux environments.
• Implementing detailed journal log collection in the Linux debug file with service name resolution and log anonymization.
• Updating the archive creation logic to conditionally add log files or fallback systemd logs.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
client/internal/debug/debug_nonlinux.go	Added stub function for systemd log fallback on non-Linux systems
client/internal/debug/debug_linux.go	Introduced robust systemd journal log collection with timeout, error handling, and anonymization
client/internal/debug/debug.go	Updated log file condition to optionally trigger systemd log fallback

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
1 Accepted issue

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud