Use functions for test samples

Instead of directly exporting JS objects in test/testsamples.js, the samples should be functions that return objects:

// Bad
export const typeSample = { id: 'typeid', name: 'folder' }
// Good
export const typeSample = () => ({ id: 'typeid', name: 'folder' })

This avoids some very annoying issues due to Vue component tests: when any sample gets added to a component's data or is watched in some way, said sample is updated to use getters and setters. This causes strange assertion errors in tests like Inputs identical but not reference equal. Currently, to avoid this, we need to add cloneDeep calls (from lodash) anywhere we use a sample that will be sent to a component, and missing one can lead to hours wasted looking for the one component test that is completely unrelated to your merge request and is breaking your stuff. I am definitely not typing this out of frustration.