9844 see predicted velocity

[fluxusfrequency]

What's this PR do?

• Adds Sam's action to fetch product velocity.
• Adds a velocity indicator to the filters toolbar.

  Any background context or notes you want to provide?

This sets the stage for grouping items in the backlog by estimated date completed when sorting by priority (#9844).

Which code should the reviewer start with?

The whole diff is pretty crucial.

How is this feature tested (either manually or automatically)?

Visit the homepage and view the new velocity icon.

What are the relevant tickets (please include link(s))?

https://sprint.ly/product/1/item/9844

Screenshots (if appropriate)

What gif best describes this PR or how it makes you feel?

Definition of Done:

• [ ] Is there appropriate test coverage?

[wookiehangover]

Let's move the velocity icon to the left of the "Type" filter so that it stays in the top left corner even when more filters are added to the view.

[fluxusfrequency]

@wookiehangover it's green now