Andrew Scott
3ca34e606d
When the zoneless scheduler is provided, we want to update the behavior of `ComponentFixture` to address common issues and painpoints in testing. Developers should never have to call `detectChanges` on a fixture manually. Instead of calling `detectChanges` after performing an action that updates state and requies a template refresh, developers should wait for change detection to run because the update needs to also have notified the scheduler. If this was not the case, the component would not work correctly in the application. Calling `detectChanges` to force an update could hide real bugs. This commit also updates the zoneless tests to uses `ComponentFixture` instead of manually attaching to the `ApplicationRef` and rewriting a lot of the helpers (`getDebugNode`, `isStable` as a value, `whenStable` as a Promise). PR Close #54024
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