message: Add changesetApplicationsRemaining to post-purchase types
diff: @@ -269,6 +269,8 @@ interface ApplyChangesetResult {
  errors: ChangesetError[];
  /** An enum representing the result of attempting to apply or calculate a changeset. */
  status: ChangesetProcessingStatus;
  + /** How many changesets can still be applied to the initial purchase. */
  + changesetApplicationsRemaining: number;
  }
  export type ChangesetProcessingStatus =
  