[TorchToLinalg] Direct lowering from Torch to Linalg for torch.aten.convolution_backward (#4384)

### Description:

- Added the direct lowering pass for `torch.aten.convolution_backward`
from Torch to Linalg. The pattern generates
`linalg.generic` ops instead of `linalg.conv_<>` for better lowering.
- Created new lit tests for backward convolution in the separate file
`convolution_backward.mlir`. Also added more test cases for better test
coverage.
- Added new e2e tests for backward convolution for better test coverage.

### Issue:

- #4355

Author: a-sidorova