fix: fix config for testing with zoneless Angular

[mikeshtro]

This PR fixes zoneless flag in the configure function. I tried to use the configure function with zoneless flag

function setup() {
  configure({ zoneless: true });
  return render(MyComponent);
}

but I got error Unexpected value 'undefined' imported by the module 'DynamicTestModule'. Please add an @NgModule annotation.

This is because provideZonelessChangeDetection is incorrectly used inside imports instead of providers.

[timdeschryver]

Thanks for raising this PR @mikeshtro
I also got a question. Do you think it's useful to also add this config to the render method, because currently it's set at the global level using the configure method.
My reasoning is that either you use zoneless or not for the whole application, and thus it isn't needed to set at test-level.

[mikeshtro]

My original idea was to add it to the render method, because I consider it to be the main method, how I setup my tests when using testing library.
But as you described we use zoneless or not for the whole application and so I think the configure method is enough, because it covers the main scenario. If we want to configure it at test-level we can always provide it manually

render(MyComponent, {
  providers: [provideZonelessChangeDetection()]
})

[timdeschryver]

Thanks @mikeshtro !