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Reduce system test sharding overhead - #12787

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cgcote wants to merge 6 commits into

ci/measure-system-test-sharding

Commits on Oct 8, 2026
- ci: test fuller system test shards
  cgcote
  committed
  31c591f
- ci: test smaller system test shards
  cgcote
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  9eb8cf6
- ci: test maximum system test parallelism
  cgcote
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  5ad084d
- Keep the fastest system test shard target
  cgcote
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  8e1948f
- Probe a thirteen minute system test shard target
  cgcote
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  4c2d597
- Select the fastest system test shard target
  cgcote
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  1f52993