Implement junit test reporter

[Jarred-Sumner]

What does this PR do?

Fixes #8019

How did you verify your code works?

Needs tests (the test was generated by cursor, it might or might not work)

[robobun]

❌ @Jarred-Sumner, your commit fe897de has 13 failures in #6298:

test/js/web/fetch/fetch.stream.test.ts - 1 failing on 🍎 14 x64

test/js/bun/http/serve-body-leak.test.ts - timeout on :alpine: 3.20 x64

test/js/bun/http/bun-serve-static.test.ts - timeout on :alpine: 3.20 x64

test/cli/install/registry/bun-install-registry.test.ts - timeout on :alpine: 3.20 x64-baseline

test/integration/next-pages/test/dev-server.test.ts - 1 failing on :alpine: 3.20 x64

test/integration/next-pages/test/dev-server.test.ts - 1 failing on :alpine: 3.20 x64-baseline

test/v8/v8.test.ts - 22 failing on :alpine: 3.20 aarch64

test/v8/v8.test.ts - 22 failing on :alpine: 3.20 x64

test/v8/v8.test.ts - 22 failing on :alpine: 3.20 x64-baseline

test/js/bun/http/serve.test.ts - segmentation fault on :alpine: 3.20 aarch64

test/js/bun/http/serve.test.ts - segmentation fault on :alpine: 3.20 x64

test/js/bun/http/serve.test.ts - segmentation fault on :alpine: 3.20 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on :alpine: 3.20 aarch64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on :alpine: 3.20 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on :alpine: 3.20 x64-baseline

test/js/bun/ffi/cc.test.ts - 1 failing on :alpine: 3.20 aarch64

test/js/bun/ffi/cc.test.ts - 1 failing on :alpine: 3.20 x64

test/js/bun/ffi/cc.test.ts - 1 failing on :alpine: 3.20 x64-baseline

test/js/node/child_process/child_process.test.ts - 1 failing on :alpine: 3.20 aarch64

test/js/node/child_process/child_process.test.ts - 1 failing on :alpine: 3.20 x64

test/js/node/child_process/child_process.test.ts - 1 failing on :alpine: 3.20 x64-baseline

test/cli/install/bun-link.test.ts - 4 failing on :alpine: 3.20 aarch64

test/cli/install/bun-link.test.ts - 4 failing on :alpine: 3.20 x64

test/cli/install/bun-link.test.ts - 4 failing on :alpine: 3.20 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🪟 2019 x64

test/js/junit-reporter/junit.test.js - 1 failing on 🪟 2019 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 12 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 20.04 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 22.04 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🍎 13 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on :alpine: 3.20 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on 🍎 14 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 20.04 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 22.04 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 12 aarch64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 12 x64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 20.04 x64

test/js/junit-reporter/junit.test.js - 1 failing on 🐧 22.04 x64

test/js/junit-reporter/junit.test.js - 1 failing on :alpine: 3.20 x64

test/js/junit-reporter/junit.test.js - 1 failing on :alpine: 3.20 x64-baseline

test/js/junit-reporter/junit.test.js - 1 failing on 🍎 14 x64

test/js/junit-reporter/junit.test.js - 1 failing on 🍎 13 x64

test/cli/run/require-cache.test.ts - 1 failing on 🪟 2019 x64