Use the shared sharded nextest workflow - #1440
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Move nextest runner allocation and artifact handling into the shared workflow from astral-sh/github-actions#5.
test.ymlselects the runner, timeout, cache policy, and shard count; uv-specific toolchains, Cargo features, Dev Drive, keychain, and filesystem fixtures remain in local platform actions. Explicit Unix Rust-cache keys keep the cache identity independent of the reusable workflow's job name.Linux defaults to one shard and Windows to three. macOS uses one complete test run on
mainand two shards when the existing CI plan enables it elsewhere, so opted-in pull requests can trade additional runner capacity for lower latency without increasing the normalmainrunner count. The aggregate required check still waits for the complete test workflow.