Enable create_vulnerabilities_via_api by default

Changelog: changed
EE: true

config/feature_flags/development/create_vulnerabilities_via_api.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/338694
 milestone: '14.3'
 type: development
 group: group::threat insights
-default_enabled: false
+default_enabled: true

ee/app/graphql/mutations/vulnerabilities/create.rb

@@ -73,7 +73,7 @@ module Mutations
       def resolve(**attributes)
         project = authorized_find!(id: attributes.fetch(:project))
 
-        raise Gitlab::Graphql::Errors::ResourceNotAvailable, 'Feature disabled' unless Feature.enabled?(:create_vulnerabilities_via_api, project)
+        raise Gitlab::Graphql::Errors::ResourceNotAvailable, 'Feature disabled' unless Feature.enabled?(:create_vulnerabilities_via_api, project, default_enabled: :yaml)
 
         params = build_vulnerability_params(attributes)
 

ee/app/services/vulnerabilities/manually_create_service.rb

@@ -17,7 +17,7 @@ module Vulnerabilities
     end
 
     def execute
-      unless Feature.enabled?(:create_vulnerabilities_via_api, @project)
+      unless Feature.enabled?(:create_vulnerabilities_via_api, @project, default_enabled: :yaml)
         return ServiceResponse.error(message: "create_vulnerabilities_via_api feature flag is not enabled for this project")
       end