Use runs-on GPU runners for CI#1439

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dfalbel wants to merge 9 commits intomainfrom

Commits on Apr 28, 2026

Use runs-on GPU runners instead of self-hosted for GPU CI jobs
dfalbel
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Serialize GPU jobs to respect single-instance AWS quota
dfalbel
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Add concurrency group to GPU jobs to prevent parallel instance creation
dfalbel
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Add skip_slow_tests() helper and skip cuda_memory_snapshot in cudatoolkit job
dfalbel
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Mark autocast grad scaler training loop test as slow
dfalbel
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Disable cuda_record_memory_history after snapshot test via withr::defer
dfalbel
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Add retry=false to GPU runner labels to always use spot instances
dfalbel
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Explicitly set spot=true on GPU runner labels
dfalbel
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Keep spot=true but remove retry=false to fix on-demand fallback issue
dfalbel
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