convert identity to phased xz in qubit characterization

[NoureldinYosri]

SingleQubitCliffordGates fail the gateset check of the grid device

Cirq/cirq-google/cirq_google/devices/grid_device.py

Lines 43 to 64 in a3eed6b

	# Gate family constants used in various parts of GridDevice logic.
	_PHASED_XZ_GATE_FAMILY = cirq.GateFamily(cirq.PhasedXZGate)
	_MEASUREMENT_GATE_FAMILY = cirq.GateFamily(cirq.MeasurementGate)
	_WAIT_GATE_FAMILY = cirq.GateFamily(cirq.WaitGate)
	_SYC_FSIM_GATE_FAMILY = ops.FSimGateFamily(gates_to_accept=[ops.SYC])
	_SQRT_ISWAP_FSIM_GATE_FAMILY = ops.FSimGateFamily(gates_to_accept=[cirq.SQRT_ISWAP])
	_SQRT_ISWAP_INV_FSIM_GATE_FAMILY = ops.FSimGateFamily(gates_to_accept=[cirq.SQRT_ISWAP_INV])
	_CZ_FSIM_GATE_FAMILY = ops.FSimGateFamily(gates_to_accept=[cirq.CZ])
	# TODO(#5050) Add GlobalPhaseGate
	# Target gates of `cirq_google.GoogleCZTargetGateset`.
	_CZ_TARGET_GATES = [_CZ_FSIM_GATE_FAMILY, _PHASED_XZ_GATE_FAMILY, _MEASUREMENT_GATE_FAMILY]
	# Target gates of `cirq_google.SycamoreTargetGateset`.
	_SYC_TARGET_GATES = [_SYC_FSIM_GATE_FAMILY, _PHASED_XZ_GATE_FAMILY, _MEASUREMENT_GATE_FAMILY]
	# Target gates of `cirq.SqrtIswapTargetGateset`
	_SQRT_ISWAP_TARGET_GATES = [
	_SQRT_ISWAP_FSIM_GATE_FAMILY,
	_PHASED_XZ_GATE_FAMILY,
	_MEASUREMENT_GATE_FAMILY,
	]

. while the objects fail the check the operations themselves are supported but after coversion to a supported format like phased xz

this was missed from #6420