Task: Create a multi-select dropdown widget for our rjsf theme

[pbastia]

Describe the task

A few pages on the reporting app require users to select multiple items from a dropdown We can display it with a component like this: https://mui.com/material-ui/react-select/#checkmarks

This card is about creating

• a widget
• the associated documentation on how to present this through RJSF

Related: #196

Acceptance Criteria

• [ ] first
• [ ] second
• [ ] third

Additional context

• Add any other context about the task here.
• Or here

[pbastia]

@BallardRobinett 👀

[rdromey]

@BallardRobinett to refine

[patriciarussellCAS]

check other code bases to see if we've done this before.

[rdromey]

Widget already exists - will just need to add drop down items in separate ticket.