devenv test: wait for processes to start

[domenkozar]

• [ ] https://github.com/seanmonstar/reqwest/pull/1623
• [ ] check if this fixes rubyonrails example
• [ ] enable only when tests use process-compose

[cloudflare-pages[bot]]

Deploying devenv with    Cloudflare Pages

Latest commit:	d9aea96
Status:	✅  Deploy successful!
Preview URL:	https://43951c0c.devenv.pages.dev
Branch Preview URL:	https://devenv-test-wait-for-process.devenv.pages.dev

View logs

[domenkozar]

For some reason even if the self.up() fails, the PID is still running so it takes 60s to timeout.