fix: make test for last seen by env not rely on array order (#5303)

This test was flaky because it relied on the order of the array
returned. To make it less flaky, we now turn the array into an object
instead and compare that.

src/lib/features/feature-toggle/tests/feature-toggle-last-seen-at.e2e.test.ts

@@ -188,7 +188,7 @@ test('response should include last seen at per environment correctly for a singl
         .get(`/api/admin/projects/default/features/${featureName}`)
         .expect(200);
 
-    expect(body.environments).toMatchObject([
+    const expected = [
         {
             name: 'default',
             lastSeenAt: '2023-08-01T12:30:56.000Z',
@@ -201,5 +201,15 @@ test('response should include last seen at per environment correctly for a singl
             name: 'production',
             lastSeenAt: '2023-08-01T12:30:56.000Z',
         },
-    ]);
+    ];
+
+    const toObject = (lastSeenAtEnvData) =>
+        Object.fromEntries(
+            lastSeenAtEnvData.map((env) => [
+                env.name,
+                { lastSeenAt: env.lastSeenAt },
+            ]),
+        );
+
+    expect(toObject(body.environments)).toMatchObject(toObject(expected));
 });