Make environments searchable by environment name

Background

A given project in Gitlab can have 1000s of environments. When allowing the user to choose one of them in a dropdown we would like to let users search by their name so they can narrow down what they are looking for.

Possible Result

Act as an enabler for frontend task #33017 (closed)

Proposal for technical implementation

As part of #36619 (closed), in !22932 (merged) a list of environments can be fetched usign GraphQL.

The new GraphQL endpoint can be used to support filters by name, so the list can be narrowed down.