Create UserSearchableDropdown Component

[lomky]

Description

We now use the SearchableDropdown component is a strongly similar way in two places, with a potential third use if we improve test/users to use the same flow. These places both use the searchable dropdown to find users based on both CSS ID or Name, via an asyncronous search after some text is entered into the field, returns the matching users to list as dropdown options, and does a final query when an option is selected to set up state.

The goal of this ticket is to create a shared component extracting this redundant functionality into a shared component.

Acceptance criteria

• UserSearchableDropdown allows for dynamic user searches
• No changes to interaction for the end users
• CodeClimate override removed

Background/context/resources

• Caseflow user status management allow search by name #14089 and its PR User Management Page - User Search Improvement #14231

[lomky]

what is this chart?

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Good opportunity to pair-develop with Design and make sure our visual interface is up to snuff!

Why 2?

• Just refactoring

Why 3?

• Doing it right!