Use vitest instead of react-scripts for tests

[edlerd]

Done

• remove react-scripts
• add vitest
• change script runner

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @lorumic or @edlerd for access.
   • With a local copy of this branch, run as described here.
2. Perform the following QA steps:
   • ensure ci is executing ts spec tests and succeeding

[webteam-app]

Demo starting at https://lxd-ui-621.demos.haus

[mas-who]

should we set the globals config so that we don't have to import test functions everywhere similar to jest?

// vitest.config.ts
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    globals: true,
  },
})

If we set this, then we just need to add this to tsconfig.json as well:

// tsconfig.json
{
  "compilerOptions": {
    "types": ["vitest/globals"]
  }
}

[edlerd]

Good idea, will change it :)

[mas-who]

LGTM. Just wondering if we should make vitest API imports global? Feel free to leave it as is.