Optimize DAGCircuit.collect_1q_runs() filter function (#12719)

In the recently merged #12650 a new rust function was added for the
filter function of the collect_1q_runs() method's internal filter
function. As part of this we need to do exclude any non-DAGOpNode dag
nodes passed to the filter function. This was previously implemented
using the pyo3 extract() method so that if the pyobject can be coerced
into a DAGOpNode for later use we continue but if it errors we know the
input object is not a DAGOpNode and return false. However, as we don't
need to return the error to python we should be using downcast instead
of extract (as per the pyo3 performance guide [1]) to avoid the error
conversion cost. This was an oversight in #12650 and I only used
extract() out of habit.

[1] https://pyo3.rs/v0.22.0/performance#extract-versus-downcast

crates/accelerate/src/euler_one_qubit_decomposer.rs

@@ -1045,10 +1045,11 @@ fn matmul_1q(operator: &mut [[Complex64; 2]; 2], other: Array2<Complex64>) {
 }
 
 #[pyfunction]
-pub fn collect_1q_runs_filter(py: Python, node: PyObject) -> bool {
-    let op_node = node.extract::<PyRef<DAGOpNode>>(py);
+pub fn collect_1q_runs_filter(node: &Bound<PyAny>) -> bool {
+    let op_node = node.downcast::<DAGOpNode>();
     match op_node {
-        Ok(node) => {
+        Ok(bound_node) => {
+            let node = bound_node.borrow();
             node.instruction.operation.num_qubits() == 1
                 && node.instruction.operation.num_clbits() == 0
                 && node