chore: split out async-rewriter tests into separate package

[addaleax]

This will be a prerequisite for productionizing a new iteration of the async rewriter, such as the one proposed in #1931.

[Copilot]

Pull request overview

This PR extracts the async rewriter’s large Mocha test suite from @mongosh/async-rewriter2 into a new reusable workspace package (@mongosh/async-rewriter-spec) so that alternative async rewriter implementations can be validated against the same spec.

Changes:

• Introduces @mongosh/async-rewriter-spec with a runTests() helper that hosts the shared async-rewriter test suite.
• Refactors @mongosh/async-rewriter2 tests to call the shared runTests() suite and exposes AsyncWriter as a named export.
• Updates workspace/CI configuration to include the new package and to only generate Evergreen unit-test tasks for packages that define test-ci.

Reviewed changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/async-rewriter2/src/index.ts	Adds a named AsyncWriter export alongside the default export.
packages/async-rewriter2/src/async-writer-babel.spec.ts	Replaces the in-file test suite with a call into @mongosh/async-rewriter-spec.
packages/async-rewriter2/package.json	Adds @mongosh/async-rewriter-spec as a dev dependency.
packages/async-rewriter-spec/tsconfig.json	Adds TS config for the new spec package outputting to lib/.
packages/async-rewriter-spec/tsconfig-lint.json	Adds lint TS config including test/ and benchmark/.
packages/async-rewriter-spec/test/fixtures/with-domain.js	Adjusts fixture to load runtime support code via an env-provided file path.
packages/async-rewriter-spec/src/index.ts	New reusable async-rewriter spec test suite implementation (runTests).
packages/async-rewriter-spec/README.md	Documents the purpose of the reusable spec package.
packages/async-rewriter-spec/package.json	New package manifest for @mongosh/async-rewriter-spec.
packages/async-rewriter-spec/LICENSE	Adds Apache 2.0 license file for the new package.
packages/async-rewriter-spec/AUTHORS	Adds AUTHORS file for the new package.
packages/async-rewriter-spec/.prettierrc.json	Adds Prettier config reference for the new package.
packages/async-rewriter-spec/.prettierignore	Adds Prettier ignore rules for build/test artifacts.
packages/async-rewriter-spec/.npmignore	Adds npm ignore rules for the new package.
packages/async-rewriter-spec/.mocharc.json	Adds Mocha config for running TS-based specs in the new package.
packages/async-rewriter-spec/.gitignore	Adds gitignore entries for build output and local artifacts.
packages/async-rewriter-spec/.eslintrc.js	Adds ESLint config for the new package.
packages/async-rewriter-spec/.eslintignore	Adds ESLint ignore rules for build output and local artifacts.
package.json	Registers packages/async-rewriter-spec in workspaces ordering.
package-lock.json	Adds workspace link entries for @mongosh/async-rewriter-spec.
mongosh.code-workspace	Adds the new package folder to the workspace and reorders entries.
.evergreen/tasks/unit-tests.js	Updates unit-test task generation to use full package.json and require test-ci script.
.evergreen.yml	Removes Evergreen unit-test tasks/artifacts related to the testing package.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

tc39/test-262 test results

     1 files       1 suites   18d 13h 47m 16s ⏱️
23 648 tests 19 873 ✅ 0 💤 3 775 ❌
45 162 runs  38 215 ✅ 0 💤 6 947 ❌

For more details on these failures, see this check.

Results for commit 11f5a81.

[github-actions]

test262 conformance tests

There has been 45 new failures in commit 04cfb29 compared to the baseline commit (main).