Update circuit construction benchmarks (#11924)

The circuit construction benchmarks had all bit rotted a fair amount and
were using syntax and functionality that no longer exists. This commit
updates the benchmarks to work with current qiskit. Longer term we
should add a CI job to ensure all the benchmarks work.

test/benchmarks/circuit_construction.py

@@ -45,7 +45,7 @@ def time_circuit_construction(self, width, gates):
         build_circuit(width, gates)
 
     def time_circuit_extend(self, _, __):
-        self.empty_circuit.extend(self.sample_circuit)
+        self.empty_circuit.compose(self.sample_circuit, inplace=True)
 
     def time_circuit_copy(self, _, __):
         self.sample_circuit.copy()
@@ -61,7 +61,7 @@ def build_parameterized_circuit(width, gates, param_count):
     while len(qc) < gates:
         for k in range(width):
             param = next(param_iter)
-            qc.u2(0, param, qr[k])
+            qc.r(0, param, qr[k])
         for k in range(width - 1):
             param = next(param_iter)
             qc.crx(param, qr[k], qr[k + 1])