[mlir][sparse] Change tests to use new syntax for ELL and slice (#67569)

Examples:

1. `#ELL = #sparse_tensor.encoding<{ lvlTypes = [ "dense", "dense",
"compressed" ], dimToLvl = affine_map<(i,j)[c] -> (c*4*i, i, j)>
}>`
to
`#ELL = #sparse_tensor.encoding<{ map = [s0](d0, d1) -> (d0 * (s0 * 4) :
dense, d0 : dense, d1 : compressed)
}>`

2. `#CSR_SLICE = #sparse_tensor.encoding<{ lvlTypes = [ "dense",
"compressed" ], dimSlices = [ (1, 4, 1), (1, 4, 2) ]
}>`
to
`#CSR_SLICE = #sparse_tensor.encoding<{ map = (d0 :
#sparse_tensor<slice(1, 4, 1)>, d1 : #sparse_tensor<slice(1, 4, 2)>) ->
(d0 : dense, d1 : compressed)
}>`