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#35457) DevTools has ~45 test files which don't distribute well across 10 shards, causing shard 3 to run 2x slower than others (104s vs ~50s). This moves DevTools build tests to a separate job with 3 shards for better load balancing.
[ci] Increase DevTools test shards and bump timeout - Increase DevTools test shards from 3 to 5 - Bump timeout to 20s --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35459). * #35458 * __->__ #35459
…35458) Jest's default test sequencer sorts alphabetically, causing large test files (eg ReactDOMFloat-test.js at 9k lines, ReactHooksWithNoopRenderer-test.js at 4k lines) to cluster in shard 3/5. This made shard 3/5 average 117s vs 77s for other shards, a 52% slowdown. I'm using filesize as a rough proxy for number of tests. This custom sequencer sorts tests by file size and distributes large files evenly across all shards instead of clustering them together. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35458). * __->__ #35458 * #35459
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