Add a flag that controls the podman's engine.image_parallel_copies #6102
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That setting in containers.conf controls how many layers podman will pull/push concurrently, system-wide. Without setting it, the default is 6. I'd like to set it higher in dev to try and exacerbate https://github.com/buildbuddy-io/buildbuddy-internal/issues/2282 which I suspect will happen more frequently if there's more parallelism hitting soci-store.
Orthogonally, it would be nice to be able to tweak this value in dev/prod to see how it affects image pull performance.
Related issues: https://github.com/buildbuddy-io/buildbuddy-internal/issues/2933