Skip autonaming for stages

These names only have to be unique within the API. Skipping autonaming makes the created name and therefore URL predictable.

awsx/apigatewayv2/httpApi.ts

@@ -220,6 +220,7 @@ export function buildHttpApi(parent: pulumi.Resource, name: string, args: schema
       `${name}-${stageKey}`,
       {
         apiId: api.id,
+        name: stageKey,
         ...stageInput,
       },
       { parent },