feat: add support to request macos runners #4930
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Summary
This PR adds support for provisioning GitHub Actions runners on macOS EC2 instances by wiring placement group configuration through the multi-runner module and introducing macOS-specific bootstrap scripts.
Motivation
macOS EC2 instances require a dedicated host (host_id), which is managed through placement groups.
This work prepares the module to request mac-based EC2 runners by consuming placement configuration as defined in #4929