fix(grafana): allow empty lists in network_access_control

[taraspos]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Allow passing empty lists in network_access_control, because both arguments are required by the upstream API, but empty list values are valid configurations.

Relations

Closes #45908

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.

[github-actions]

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