[ci] (control) leave test concurrency at 8#94142
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We're using 16 core machines, our `TEST_CONCURRENCY` of 8 is arbitrary. This tries increasing that to 12. - GH Actions for 8 (control, #94142): https://github.com/vercel/next.js/actions/workflows/build_and_test.yml?query=branch%3Abgw%2Ftest-concurrency-8 - GH Actions for 12 (this branch): https://github.com/vercel/next.js/actions/workflows/build_and_test.yml?query=branch%3Abgw%2Ftest-concurrency-12 - GH Actions for 16 (#94133): https://github.com/vercel/next.js/actions/workflows/build_and_test.yml?query=branch%3Abgw%2Ftest-concurrency-16 It appeared that (across a couple of runs) that `TEST_CONCURRENCY=16` *may* lead to more test failures. Plausibly this could be due to timeouts. `TEST_CONCURRENCY=12` does not appear to be causing noticeably more failures than usual, and seems to be slightly speeding things up. Datadog SQL: ``` SELECT SUM(duration) / 1000 / 1000 / 1000 / 60 as minutes, branch, ci_pipeline_id FROM dd.ci_pipelines( columns => ARRAY ['@ci.pipeline.id', '@duration', '@git.branch'], event_type => 'step', filter => '@git.repository.id_v2:github.com/vercel/next.js @ci.pipeline.name:build-and-test @ci.provider.instance:github-actions @ci.pipeline.id:(26473602379-1 OR 26484229016-1 OR 26485947297-1 OR 26493064901-1 OR 26492002693-1 OR 26485986756-1 OR 26485929595-1 OR 26484214883-1 OR 26480156826-1)', from_timestamp => now() - INTERVAL '30 days', to_timestamp => now() ) AS ( ci_pipeline_id VARCHAR, duration BIGINT, branch VARCHAR ) GROUP BY branch, ci_pipeline_id ORDER BY branch; ``` <img width="1193" height="807" alt="Screenshot 2026-05-26 at 11 07 05 PM" src="https://github.com/user-attachments/assets/bbd75ee1-9766-48a8-90da-6225908de251" />
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