[misc] Enable race detector in Go test runs

[mlsmaycon]

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• 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)
• This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — OR I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See CONTRIBUTING.md.

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[sonarqubecloud]

Quality Gate passed

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0 New issues
0 Accepted issues

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0.0% Coverage on New Code
0.0% Duplication on New Code

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[github-actions]

Release artifacts

Built for PR head 6a6b25b in workflow run #15711.

Artifact	Link
All release artifacts	Download
Linux packages	Download
Windows packages	Download
macOS packages	Download
UI artifacts	Download
UI macOS artifacts	Download

GHCR images (amd64)

• ghcr.io/netbirdio/management:pr-6386
• ghcr.io/netbirdio/netbird-server:pr-6386
• ghcr.io/netbirdio/netbird:pr-6386
• ghcr.io/netbirdio/relay:pr-6386
• ghcr.io/netbirdio/reverse-proxy:pr-6386
• ghcr.io/netbirdio/signal:pr-6386
• ghcr.io/netbirdio/upload:pr-6386

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