Merge pull request #20367 from ahrtr/20250721_v2store_flaky_test_3.5

[release-3.5] Fix flaky TestCtlV2CustomContentWithAuthData

Author: ahrtr

tests/e2e/v2store_deprecation_test.go

@@ -169,6 +169,10 @@ func TestCtlV2CustomContentWithAuthData(t *testing.T) {
 	err = etcdctlUserRemove(epc, "user1")
 	require.NoError(t, err)
 
+	t.Log("Add t a learner to trigger a final v2 snapshot")
+	_, _, err = epc.AddMember(nil, true, t)
+	require.NoError(t, err)
+
 	t.Log("Stop the cluster")
 	require.NoError(t, epc.Stop())