Disable QasmQobjInstruction validation during circuit assembly.

[kdk]

Summary

Following #3368 , disables on-init validation of QasmQobjInstruction during assemble_circuits.

$ asv continuous --bench assembl master assemble_circuits-disable-instruction-validation
...
       before           after         ratio
     [2ad7a666]       [45740444]
     <master>         <assemble_circuits-disable-instruction-validation>
-     1.26±0.06ms         584±10μs     0.46  assembler.AssemblerBenchmarks.time_assemble_circuit(1, 8)
-     4.50±0.07ms       1.55±0.2ms     0.34  assembler.AssemblerBenchmarks.time_assemble_circuit(8, 8)
-      2.11±0.5ms         701±20μs     0.33  assembler.AssemblerBenchmarks.time_assemble_circuit(2, 8)
-     2.95±0.03ms         966±80μs     0.33  assembler.AssemblerBenchmarks.time_assemble_circuit(5, 8)
-        383±10ms        96.2±10ms     0.25  assembler.AssemblerBenchmarks.time_assemble_circuit(8, 1024)
-        969±10ms         204±20ms     0.21  assembler.AssemblerBenchmarks.time_assemble_circuit(5, 4096)
-      32.9±0.6ms       6.86±0.2ms     0.21  assembler.AssemblerBenchmarks.time_assemble_circuit(5, 128)
-        48.4±1ms       9.94±0.5ms     0.21  assembler.AssemblerBenchmarks.time_assemble_circuit(8, 128)
-        777±40ms         156±10ms     0.20  assembler.AssemblerBenchmarks.time_assemble_circuit(8, 2048)
-      1.55±0.04s          309±5ms     0.20  assembler.AssemblerBenchmarks.time_assemble_circuit(8, 4096)
-        499±20ms         98.9±4ms     0.20  assembler.AssemblerBenchmarks.time_assemble_circuit(5, 2048)
-        17.9±1ms      3.53±0.07ms     0.20  assembler.AssemblerBenchmarks.time_assemble_circuit(2, 128)
-         256±3ms         49.2±2ms     0.19  assembler.AssemblerBenchmarks.time_assemble_circuit(5, 1024)
-         129±4ms         24.5±1ms     0.19  assembler.AssemblerBenchmarks.time_assemble_circuit(2, 1024)
-        13.6±2ms       2.57±0.3ms     0.19  assembler.AssemblerBenchmarks.time_assemble_circuit(1, 128)
-        341±20ms         63.2±4ms     0.19  assembler.AssemblerBenchmarks.time_assemble_circuit(1, 4096)
-         168±7ms       30.6±0.2ms     0.18  assembler.AssemblerBenchmarks.time_assemble_circuit(1, 2048)
-       92.0±20ms         16.4±3ms     0.18  assembler.AssemblerBenchmarks.time_assemble_circuit(1, 1024)
-         537±6ms         95.0±3ms     0.18  assembler.AssemblerBenchmarks.time_assemble_circuit(2, 4096)
-        281±20ms         48.2±1ms     0.17  assembler.AssemblerBenchmarks.time_assemble_circuit(2, 2048)

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