Searchable user list on feature flag strategy

Problem to solve

#35930 (closed) introduced the ability to apply lists as a strategy, but a user could potentially define a large number of lists. This would make the dropdown for selecting the list to apply very long and difficult to use.

Intended users

• Developers who create feature flags
• QA engineers enabling/disabling flags
• Release managers who want to control which features are released and to which customer base
• Support engineers that wish to release features to beta customers or test version to fix bugs for specific customers

Proposal

Add the ability to search for a list when selecting a list to apply.

UX proposal

Desc	Mockup
Desktop List select list with search
List dropdown loading
List dropdown empty state

Permissions and Security

A user who has permission to the environments referenced in the strategy can modify the strategy settings.

Documentation

Testing

What does success look like, and how can we measure that?

• Number of times a list is added/removed to a feature flag
• Number of times a user is added/removed to a list

What is the type of buyer?

Links / references