Fix consistency of QNode results processing

[andrijapau]

Context:

The output of QNode execution was not consistent based on the type of the qfunc output,

@qml.qnode(qml.device('default.qubit'))
def circuit(t):
    return t([qml.expval(qml.Z(0))])
>>> circuit(tuple)
1.0
>>> circuit(list)
[1.0]

Description of the Change:

Update how the results of the execution get type converted based on the qfunc output type.

After this fix we get consistency,

@qml.qnode(qml.device('default.qubit'))
def circuit(t):
    return t([qml.expval(qml.Z(0))])
>>> circuit(tuple)
(1.0,)
>>> circuit(list)
[1.0]

Benefits: Consistency

Possible Drawbacks: Output of QNode execution may look different than people are used to.

[sc-77682]

[github-actions]

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