VED-874: Fix MNS unsubscribe step in teardown pipeline. (#940)

Author: mfjarvis

.github/workflows/pr-teardown.yml

@@ -63,6 +63,7 @@ jobs:
       - name: Unsubscribe MNS
         working-directory: "./lambdas/mns_subscription"
         env:
+          APIGEE_ENVIRONMENT: int
           SQS_ARN: ${{ env.ID_SYNC_QUEUE_ARN }}
         run: |
           poetry install --no-root