Unconditionally cleanup severless projects. (#4590) (#4591)

(cherry picked from commit 516e41c)

Co-authored-by: Craig MacKenzie <craig.mackenzie@elastic.co>

Author: mergify[bot]

.buildkite/hooks/pre-exit

@@ -10,11 +10,8 @@ if [[ "$BUILDKITE_PIPELINE_SLUG" == "elastic-agent" && "$BUILDKITE_STEP_KEY" ==
 
   # Perform cleanup of integration tests resources
   echo "--- Cleaning up integration test resources"
-  if [[ "$BUILDKITE_STEP_KEY" == "serverless-integration-tests" ]]; then
-    STACK_PROVISIONER=serverless SNAPSHOT=true mage integration:clean
-  else
-    SNAPSHOT=true mage integration:clean
-  fi
+  STACK_PROVISIONER=serverless SNAPSHOT=true mage integration:clean
+  SNAPSHOT=true mage integration:clean
 fi
 
 if [ -n "$GOOGLE_APPLICATION_CREDENTIALS" ]; then