chore: merged Jest changedSince testing into main PR Jest job#115549
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scttcper
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May 14, 2026
Prevents MERGE_BASE from being set when a merge commit lands on master, which would cause jest --changedSince to fail in the shallow-cloned jest job.
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#110568 (ENG-7103) added an optional, non-blocking CI job that runs Jest with
--changedSince <merge_base>. It's been stable (per data crunching in ENG-7687), so this graduates it into the requiredfrontend-jest-testsjob. That means we'll only be running one Jest job per PR:merge_basecan be computed, Jest will run with--changedSince(this is the common flow for most frontend-code-only PRs)This actually removes
frontend-optional.ymlaltogether. The Jest tests were the only things running in it as of #115504. 🔪Fixes ENG-7688.