Fix cleanup of parameters upon pipeline retirement

**Why?**

At the moment, the pipeline deletion process attempts to delete the parameters
at `/deployment/${pipeline_name}/regions`. However, the path it should use
needs to include the source of the pipeline definition. In this case, that is
`S3`. So it should have deleted: `/deployment/S3/${pipeline_name}/regions`.

Additionally, if the parameter is not found, it would mark that as a failure.
While there is nothing to delete if it isn't found, so it should accept that
instead.

**What?**

Fixed path and added a catch to make the ParameterNotFound exception pass
anyway.

src/lambda_codebase/initial_commit/bootstrap_repository/adf-bootstrap/deployment/pipeline_management.yml

@@ -603,11 +603,22 @@ Resources:
                   "DeletePipelineParams": {
                     "Type": "Task",
                     "Parameters": {
-                      "Name.$": "States.Format('/deployment/{}/regions', $.pipeline_name)"
+                      "Name.$": "States.Format('/deployment/S3/{}/regions', $.pipeline_name)"
                     },
+                    "Catch": [
+                      {
+                        "ErrorEquals": "ParameterNotFound",
+                        "Next": "ParameterNotFoundFallback"
+                      }
+                    ],
                     "Resource": "arn:${AWS::Partition}:states:::aws-sdk:ssm:deleteParameter",
                     "ResultPath": "$.ssm_delete_param.result",
                     "End": true
+                  },
+                  "ParameterNotFoundFallback": {
+                    "Type": "Pass",
+                    "Result": "Parameter not found, nothing to delete, all good",
+                    "End": true
                   }
                 }
               },