Make LRE compatible with non-cirq circuits

[purva-thakre]

As discussed in another PR: #2347 (comment)

Two different ways to implement the optional args led to errors. Either the one_to_many argument was ignored (first code block) or _pop_measurement was used on a Qiskit circuit instead of converting the circuit to a cirq circuit first (second code block).

@accept_qprogram_and_validate
def multivariate_layer_scaling( input_circuit, degree, ............, one_to_many = True)

Similar to how the optional arg is used in PEC, I also tried changing multivariate_layer_scaling to _cirq_multivariate_layer_scaling such that the new multivariate_layer_scaling only accepted a QPROGRAM as input.

 noise_scaling_func = accept_qprogram_and_validate(
      _cirq_multivariate_layer_scaling,
      one_to_many=True,
  )
  scaled_circuits = noise_scaling_func(
      input_circuit, degree, fold_multiplier, num_chunks, folding_method
  )
 return scaled_circuits