ci: show in annotations if a failing or flaky file is new

[nektro]

from https://buildkite.com/bun/bun/builds/23050

[robobun]

^{Updated 12:42 AM PT - Aug 15th, 2025}

❌ @nektro, your commit 291a3ba has 4 failures in Build #23070:

• test/js/node/test/parallel/test-worker-memory.js - code 1 on 🍎 14 aarch64
• test/js/node/worker_threads/worker_threads.test.ts - pid 26591 segmentation fault on 🐧 24.04 aarch64
• test/js/node/test/parallel/test-gc-http-client-connaborted.js - timeout on 🐧 12 aarch64
• test/js/node/test/parallel/test-child-process-spawnsync-shell.js - timeout on 🪟 2019 x64
• test/js/node/test/parallel/test-child-process-spawnsync-shell.js - timeout on 🪟 2019 x64-baseline

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🧪   To try this PR locally:

bunx bun-pr 21882

That installs a local version of the PR into your bun-21882 executable, so you can run:

bun-21882 --bun