Enforce min width on `MultiSelect`
Created by: courier-new
Part 2, closes https://github.com/sourcegraph/sourcegraph/issues/37116.
We're the only consumers of this component at the moment so this feels like a reasonable change at the Wildcard component level.
Test plan
Manually verified, tested at different screen widths. Component also has Storybook coverage.
App preview:
Check out the client app preview documentation to learn more.