Add doesUsernameExist

src/index.tsx

@@ -2154,6 +2154,7 @@ export enum ProcessingStatusEnum {
 
 export type Query = {
   __typename?: "Query";
+  doesUsernameExist: Scalars["Boolean"]["output"];
   getAggregatedShotMetrics: Array<AggregateResultGql>;
   getBucketSet?: Maybe<BucketSetGql>;
   getDeployedConfig: DeployedConfigGql;
@@ -2176,6 +2177,10 @@ export type Query = {
   waitFor: Scalars["Float"]["output"];
 };
 
+export type QueryDoesUsernameExistArgs = {
+  candidateUsername: Scalars["String"]["input"];
+};
+
 export type QueryGetAggregatedShotMetricsArgs = {
   aggregateInput: AggregateInputGql;
 };