chore(jest-util): replace p-limit with inline implementation

[roli-lpci]

Summary

Replace the p-limit package (and its transitive yocto-queue dependency) with a ~30-line inline concurrency limiter in jest-util. The implementation covers the exact API surface Jest uses: pLimit(n) returning a function that queues async work with bounded concurrency.

Packages updated:

• jest-changed-files — process-spawning mutex (concurrency 5)
• jest-circus — concurrent test limiter
• jest-jasmine2 — concurrent test limiter
• jest-runner — in-band and parallel test run limiters

The e2e test fixture (e2e/transform/transform-runner/runner.ts) still uses p-limit directly from the root devDependencies, which is appropriate for a test fixture.

Test plan

• yarn build:js compiles cleanly
• ESLint clean on all changed files
• Prettier clean on all changed files
• yarn constraints passes
• yarn dedupe --check passes

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The committers listed above are authorized under a signed CLA.

• ✅ login: roli-lpci / name: Roli Bosch (7590848, 76df202)

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commit: cbc8927