ci: Update post-validation-destroy-slz-roks-and-obs-instances.sh (#235)

Author: ocofaigh

tests/scripts/post-validation-destroy-slz-roks-and-obs-instances.sh

@@ -1,7 +1,7 @@
 #! /bin/bash
 
 ########################################################################################################################
-## This script is used by the catalog pipeline to destroy the SLZ ROKS Cluster, which was provisioned as a            ##
+## This script is used by the catalog pipeline to destroy the SLZ OCP Cluster, which was provisioned as a            ##
 ## prerequisite for the WAS extension that is published to the catalog                                                ##
 ########################################################################################################################
 
@@ -12,8 +12,9 @@ TF_VARS_FILE="terraform.tfvars"
 
 (
   cd ${TERRAFORM_SOURCE_DIR}
-  echo "Destroying prerequisite SLZ ROKS Cluster and Observability instances .."
+  echo "Destroying prerequisite SLZ OCP Cluster and Observability instances .."
   terraform destroy -input=false -auto-approve -var-file=${TF_VARS_FILE} || exit 1
+  rm -f "${TF_VARS_FILE}"
 
   echo "Post-validation completed successfully"
 )