Many mentions to QASM should be changed to OpenQASM 2 (backport #9351)

[mergify]

This is an automatic backport of pull request #9351 done by Mergify.
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Changes to be committed:
	modified:   qiskit/algorithms/optimizers/spsa.py
	modified:   qiskit/assembler/assemble_circuits.py
	modified:   qiskit/circuit/controlflow/for_loop.py
	modified:   qiskit/circuit/quantumcircuit.py
	modified:   qiskit/compiler/assembler.py
	modified:   qiskit/converters/ast_to_dag.py
	modified:   qiskit/providers/basicaer/qasm_simulator.py
	modified:   qiskit/providers/fake_provider/fake_qasm_backend.py
	modified:   qiskit/providers/fake_provider/fake_qasm_simulator.py
	modified:   qiskit/providers/models/backendconfiguration.py
	modified:   qiskit/qasm/node/__init__.py
	modified:   qiskit/qasm/node/binaryoperator.py
	modified:   qiskit/qasm/node/unaryoperator.py
	modified:   qiskit/qasm/qasm.py
	modified:   qiskit/qasm3/__init__.py
	modified:   qiskit/qasm3/exporter.py
	modified:   qiskit/qasm3/printer.py
	modified:   qiskit/qobj/common.py
	modified:   qiskit/qobj/qasm_qobj.py
	modified:   qiskit/result/result.py
	modified:   qiskit/tools/jupyter/library.py
	modified:   test/python/qasm3/test_export.py
	modified:   test/python/transpiler/test_mappers.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   qiskit/extensions/hamiltonian_gate.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[coveralls]

Pull Request Test Coverage Report for Build 6356953384

• 16 of 18 (88.89%) changed or added relevant lines in 10 files are covered.
• 298 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.02%) to 87.231%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/circuit/quantumcircuit.py	0	1	0.0%
qiskit/qasm/qasm.py	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/expr.rs	1	93.76%
crates/qasm2/src/lex.rs	6	90.4%
crates/qasm2/src/parse.rs	24	96.2%
qiskit/visualization/circuit/matplotlib.py	267	50.0%

Totals
Change from base Build 6356007382:	-0.02%
Covered Lines:	74114
Relevant Lines:	84963

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💛 - Coveralls