Perform BarrierBeforeFinalMeasurements analysis in paralle

With #13410 removing the non-threadsafe structure from our circuit
representation we're now able to read and iterate over a DAGCircuit from
multiple threads. This commit is the first small piece doing this, it
moves the analysis portion of the BarrierBeforeFinalMeasurements pass to
execure in parallel. The pass checks every node to ensure all it's
decendents are either a measure or a barrier before reaching the end of
the circuit. This commit iterates over all the nodes and does the check
in parallel.

crates/accelerate/src/barrier_before_final_measurement.rs

@@ -12,6 +12,7 @@
 
 use hashbrown::HashSet;
 use pyo3::prelude::*;
+use rayon::prelude::*;
 use rustworkx_core::petgraph::stable_graph::NodeIndex;
 
 use qiskit_circuit::circuit_instruction::ExtraInstructionAttributes;
@@ -30,8 +31,8 @@ pub fn barrier_before_final_measurements(
     dag: &mut DAGCircuit,
     label: Option<String>,
 ) -> PyResult<()> {
-    let final_ops: HashSet<NodeIndex> = dag
-        .op_nodes(true)
+    let node_indices: Vec<NodeIndex> = dag.op_nodes(true).collect();
+    let final_ops: HashSet<NodeIndex> = node_indices.into_par_iter()
         .filter(|node| {
             let NodeType::Operation(ref inst) = dag.dag()[*node] else {
                 unreachable!();