Vue: Use parameters.component if available

[shilman]

In Vue stories, you currently need to pass a component argument as part of the story input (for some modes):

export const basic = () => ({
  components: { InfoButton },
  template: '<info-button label="I\'m a button!"/>',
});

However, in 5.2 and later, it's recommended to pass this as part of the component metadata:

export default {
  title: 'InfoButton',
  component: InfoButton,
};

This gets translated into the underlying API call:

storiesOf('InfoButton', module)
  .addParameters({ component: InfoButton })
  .add('Basic', () => ...);

Therefore Vue should use parameters.component if it's available and the story's component ISN'T available. If possible, in 6.0 we should deprecate the Story's component, and in 7.0 we should remove support entirely.

Related: #8673

[pksunkara]

@shilman Should you close #8109 because they look the same?

[shilman]

@pksunkara good call. closing this issue instead as dupe to #8109, since that one already has upvotes.