fix: search events by user ID, not by user name (#7846)

Changes the event search handling, so that searching by user uses the
user's ID, not the "createdBy" name in the event. This aligns better
with what the OpenAPI schema describes it.

src/lib/features/events/event-service.ts

@@ -177,7 +177,7 @@ export default class EventService {
 
         if (params.createdBy) {
             const parsed = parseSearchOperatorValue(
-                'created_by',
+                'created_by_user_id',
                 params.createdBy,
             );
             if (parsed) queryParams.push(parsed);

src/test/e2e/api/admin/event-search.e2e.test.ts

@@ -183,7 +183,7 @@ test('should filter events by created by', async () => {
     await eventService.storeEvent({
         type: FEATURE_CREATED,
         createdBy: '[email protected]',
-        createdByUserId: TEST_USER_ID,
+        createdByUserId: TEST_USER_ID + 1,
         ip: '127.0.0.1',
     });
 
@@ -194,7 +194,7 @@ test('should filter events by created by', async () => {
         ip: '127.0.0.1',
     });
 
-    const { body } = await searchEvents({ createdBy: 'IS:[email protected]' });
+    const { body } = await searchEvents({ createdBy: `IS:${TEST_USER_ID}` });
 
     expect(body).toMatchObject({
         events: [