Add migration to change environment_roles role column from string to

enum type.
Fix tests and functions affected by the column type change.

tests/routes/applications/test_init.py

@@ -9,9 +9,7 @@ def test_environment_access_with_env_role(client, user_session):
     app_role = ApplicationRoleFactory.create(
         user=user, application=environment.application
     )
-    EnvironmentRoleFactory.create(
-        application_role=app_role, environment=environment, role="developer"
-    )
+    EnvironmentRoleFactory.create(application_role=app_role, environment=environment)
     user_session(user)
     response = client.get(
         url_for("applications.access_environment", environment_id=environment.id)