filter runners for type project_type

This change adds a filter for type project_type to the query for Trusted Runners. This is needed because additional Shared Runners are available in the project now to run the lint job (verify). Previously only Trusted Runners were available in the project so a simple list() was enough to get all Trusted Runners. Now we can manage the Trusted Runners and have Shared Runners in the same project.

Follow up to !38 (merged)