Add Core Usage Metrics Components to Storybook

[Monkeychip]

This PR is a follow up of the Core Usage Metrics project, released in 1.4. For that project, we created 3 new components. This PR adds those components to Storybook.

Additionally, this PR:

• Changes the name of the component HttpRequestsBarChartSmall to HttpRequestsBarChartSimple. This makes more sense when viewing from Storybook. See screenshot.

• My prettier configuration automatically reformatted the http-requests-bar-chart.stories.js file. I agree with the formatting changes, and so am committing them in this PR.

• I double-checked that the renamed component still shows on the UI as it did before.

Here is a gif of the 3 new components on Storybook.

Also, I believe this should be a 1.4.1 milestone, but let me know if that's incorrect.

[andaley]

thank you for adding these to storybook! this is great.

while reviewing this PR, i noticed 2 things from playing with the gridContainer prop on SelectableCard and SelectableCardContainer:

the first is that the gridContainer prop doesn't change the view of the SelectableCard (or at least, not that i can tell). so maybe this prop should be removed from the knobs section on the SelectableCard page in Storybook? since it seems like that prop is only relevant when the component itself is rendered in context (i.e. inside a SelectableCardContainer). totally up to you, though.

the second is that toggling gridContainer breaks the layout of the SelectableCards when the component is rendered in isolation (i.e. in Storybook, and without all the css from the actual Metrics page). i don't think this needs to change in the scope of this PR, but it's something to keep in mind if/when we use this component in other places -- the component will need to be refactored a bit to work in various settings.

you can see examples of this here:

anyway, just sharing these observations here for posterity. definitely not blockers, so i'll go ahead and approve!

[Monkeychip]

@noelledaley These are great comments, thank you. I went ahead and removed gridContainer knob from the selectable-card.