fix(homeassistant): Fix homeassistant commissioning of light_eth

Fix light_eth example of rs-matter-stack.

fn network_interfaces() gets called with
ArrayAttributeRead::ReadOne index beyond the length of the interfaces
present.

Return a ConstraintError when no netif was matched.

The change fixes this error message which aborts the commissioning
process:

rs_matter::respond] Responder: Handler 0 / exchange 7::1: Abandoned
because of error Error::InvalidAction

Author: thouters

rs-matter/src/dm/clusters/gen_diag.rs

@@ -241,7 +241,7 @@ impl ClusterHandler for GenDiagHandler<'_> {
                 })?;
 
                 parent_builder.take().ok_or_else(|| {
-                    ErrorCode::InvalidAction.into() // TODO
+                    ErrorCode::ConstraintError.into() // TODO
                 })
             }
             ArrayAttributeRead::ReadNone(builder) => builder.end(),