Detect Periphery step from buildkite pipeline

Author: RafaelKayumov

.buildkite/pipeline.yml

@@ -79,13 +79,6 @@ steps:
         agents:
           queue: linter
 
-      - label: "🧟 Detect unused code"
-        command: ".buildkite/commands/run-periphery.sh"
-        depends_on: build
-        plugins: [$CI_TOOLKIT]
-        notify:
-          - github_commit_status:
-              context: Periphery - Detect unused code
 
       - label: 🧹 Lint Translations
         command: gplint /workdir/WooCommerce/Resources/AppStoreStrings.pot