GitLab introduces new machine types for GitLab SaaS Linux Runners

Introduces two new machine types for GitLab SaaS Runners on Linux: `saas-linux-medium-amd64` (2 vCPU, 8GB RAM) and `saas-linux-large-amd64` (4 vCPU, 16GB RAM), powered by Google Compute N2D VMs. These offer performance improvements for compute-intensive CI jobs, with the medium type available to all subscriptions and the large type to paid plans and open-source program members. Benchmarking shows an average 41% reduction in CI job execution time for the medium type compared to the small type. The post also details how to tag CI jobs to utilize these new machine types and explains the different CI minute consumption rates (cost factors) for each machine type.