6 files declare their use of DeveloperAppInterface in Apigee Edge 8

ApigeeMockApiClientHelperTrait.php in tests/modules/apigee_mock_api_client/tests/src/Traits/ApigeeMockApiClientHelperTrait.php

apigee_edge_actions.module in modules/apigee_edge_actions/apigee_edge_actions.module

CredsUtilsTrait.php in tests/src/Traits/CredsUtilsTrait.php

DeveloperAppUITestTrait.php in tests/src/Functional/DeveloperAppUITestTrait.php

DeveloperAppViewControllerForDeveloper.php in src/Controller/DeveloperAppViewControllerForDeveloper.php

TeamApiProductAccessTest.php in modules/apigee_edge_teams/tests/src/Functional/TeamApiProductAccessTest.php