fix: identify user before sending warehouse test event (#8356)

Author: Zaimwa9

frontend/web/components/pages/environment-settings/tabs/warehouse-tab/__tests__/sendWarehouseTestEvent.test.ts

@@ -28,6 +28,7 @@ describe('sendWarehouseTestEvent', () => {
         defaultFlags: {},
         enableEvents: true,
         environmentID: 'env-key-123',
+        identity: 'test_warehouse_user',
         preventFetch: true,
       }),
     )

frontend/web/components/pages/environment-settings/tabs/warehouse-tab/sendWarehouseTestEvent.ts

@@ -20,6 +20,7 @@ const sendWarehouseTestEvent = async (environmentId: string): Promise<void> => {
     enableEvents: true,
     environmentID: environmentId,
     fetch: globalThis.fetch.bind(globalThis),
+    identity: 'test_warehouse_user',
     preventFetch: true,
     ...(Project.flagsmithClientEventsAPI && {
       eventProcessorConfig: {