update tests to use np.allclose and to not use qml.map

[timmysilv]

Two things made tests fails:

1. tests were using qml.map which creates QNodeCollections. Those are deprecated, and don't work with the new return system
2. assertAllAlmostEqual has custom logic if the first arg (the qnode result) is a tuple, which they now are with the new return system. Unfortunately, the custom logic is not what we want in the regular case

Solutions:

1. Stop using QNodeCollection. Sometimes I just return the same observable 6 times, sometimes we don't even need a collection
2. Just use np.allclose (renaming delta to atol) in those cases because it's what we want anyway

[timmysilv]

[sc-35013]

[rmoyard]

Thanks @timmysilv it looks good to me 👍

[lillian542]

Looks good to me!