DX-2211: Fix CI Tests

[CahidArda]

Will fix issues in express and sveltekit:

• express is missing types definition (see)
• sveltekit had the wrong node version (I bumped node to 22 last week. Sveltekit doesn't work at 22 apparently). After downgrading the 20, we got another error

[vite]: Rollup failed to resolve import "esm-env" from "/vercel/path0/node_modules/svelte/src/internal/server/index.js".

Fixed it by removing preserveSymLinks: true

• reduce flakiness of tests
• used vitest instead of bun to address the requests getting stuck. Couldn't understand the underlying issue but switching to vitest solved the issues.

[Copilot]

Pull Request Overview

This PR improves CI stability and fixes several configuration issues across multiple framework examples:

• Migrates test runner from Bun to Vitest to resolve request handling issues
• Adds missing Express type definitions
• Fixes SvelteKit build errors by removing preserveSymlinks and adjusting Node version
• Standardizes test configuration and reduces test flakiness

Reviewed Changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tsup.config.ts	Adds "express" to external dependencies list
src/constants.ts	Updates version from v0.2.21 to v0.2.22
examples/sveltekit/vite.config.ts	Removes preserveSymlinks configuration
examples/sveltekit/svelte.config.js	Removes outdated adapter comments
examples/sveltekit/package.json	Adds Vitest dependencies and switches from file: to latest package version
examples/sveltekit/ci.test.ts	Migrates from Bun to Vitest test imports and adjusts timeout syntax
examples/nextjs/package.json	Adds Vitest dependencies and zod package
examples/nextjs/ci.test.ts	Migrates test imports from Bun to Vitest
examples/nextjs-pages/package.json	Adds Vitest dependencies
examples/nextjs-pages/ci.test.ts	Migrates test imports and adjusts timeout syntax
examples/fastify/package.json	Switches from file: to latest package version
examples/express/vitest.config.ts	Creates new Vitest configuration file
examples/express/package.json	Adds Express type definitions and Vitest dependencies
examples/express/ci.test.ts	Migrates from Bun to Vitest and adds dotenv import
examples/cloudflare-workers-hono/package.json	Updates Vitest version and adds test scripts
examples/cloudflare-workers-hono/ci.test.ts	Migrates test imports and adjusts timeout syntax
examples/ci/package.json	Adds Vitest dependencies and pins workflow version
examples/ci/app/ci/utils.test.ts	Migrates test imports from Bun to Vitest
examples/ci/app/ci/upstash/redis.test.ts	Migrates to Vitest with async test handling and fixes test structure
examples/ci/app/ci/ci.test.ts	Migrates test imports and adjusts timeout syntax
.github/workflows/test.yaml	Replaces Bun with pnpm/Vitest across all CI jobs

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[linear]

DX-2211 workflow-js - fix ci