chore: use fixture vs WebSocketServer

[kettanaito]

• Attempt to address Flaky test at ws.server.connect.browser.test.ts #2557

Motivation

There's something clearly off with how the WebSocketServer utility integrates with the Playwright tests:

    FastifyError: Fastify has already been closed and cannot be reopened

       at ../support/WebSocketServer.ts:42

      40 |
      41 |   public async listen(port = 0): Promise<void> {
    > 42 |     const address = await this.app.listen({
         |                                    ^
      43 |       host: '127.0.0.1',
      44 |       port,
      45 |     })

To make sure that the server is managed properly, I'm moving it to a fixture. I hope this helps in preventing Fastify from failing here.

[kettanaito]

Released: v2.10.5 🎉

This has been released in v2.10.5!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

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