Add env option for node:worker_threads

[paperclover]

What does this PR do?

• Types: Fix Worker and Node Worker being the same type; they are different.
• Implement the env option for workers.
• In some stubbed parts of worker_threads, throw better errors.
• .terminate calls unref properly
• ref true is default

Makes sveltekit work

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

new automated tests

[github-actions]

✅ prettier errors have been resolved. Thank you.

^{#0303faceb2f302198ca76eaf81a335a5d93e01b5}

[github-actions]

❌ @paperdave 6 files with test failures on bun-darwin-aarch64:

• test/bundler/bundler_npm.test.ts
• test/js/bun/test/test-test.test.ts
• test/js/bun/util/bun-isMainThread.test.js
• test/js/node/dns/node-dns.test.js
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/web/worker.test.ts

View test output

^{#0303faceb2f302198ca76eaf81a335a5d93e01b5}

[github-actions]

❌ @paperdave 6 files with test failures on linux-x64-baseline:

• test/js/bun/test/test-test.test.ts
• test/js/bun/util/bun-isMainThread.test.js
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/prisma/prisma.test.ts
• test/js/web/fetch/fetch.test.ts
• test/js/web/worker.test.ts

View test output

^{#0303faceb2f302198ca76eaf81a335a5d93e01b5}

[github-actions]

❌ @paperdave 5 files with test failures on linux-x64:

• test/js/bun/test/test-test.test.ts
• test/js/bun/util/bun-isMainThread.test.js
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/prisma/prisma.test.ts
• test/js/web/worker.test.ts

View test output

^{#0303faceb2f302198ca76eaf81a335a5d93e01b5}

[github-actions]

❌ @paperdave 8 files with test failures on bun-darwin-x64-baseline:

• test/js/bun/spawn/spawn-streaming-stdin.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/bun/test/test-test.test.ts
• test/js/bun/util/bun-isMainThread.test.js
• test/js/third_party/esbuild/esbuild-child_process.test.ts
• test/js/third_party/webpack/webpack.test.ts
• test/js/web/timers/setTimeout.test.js
• test/js/web/worker.test.ts

View test output

^{#0303faceb2f302198ca76eaf81a335a5d93e01b5}

[paperclover]

ready for rewview