feat(infra): Allow node role labeling for system nodes

[amdove]

Description

Small change to allow system nodes to be labeled accordingly. This enables affinity and anti-affinity rules to be created based on the node role labels.

Category of change

• Bug fix (non-breaking change which fixes an issue)
• Version upgrade (upgrading the version of a service or product)
• New feature (non-breaking change which adds functionality)
• Build: a code change that affects the build system or external dependencies
• Performance: a code change that improves performance
• Refactor: a code change that neither fixes a bug nor adds a feature
• Documentation: documentation changes
• Breaking change (fix or feature that would cause existing functionality to not work as expected)