Support `torch.concat` alias, add `cat` OpInfo & remove OpInfo test_out skips {cat...

Support `torch.concat` alias, add `cat` OpInfo & remove OpInfo test_out skips {cat, stack, hstack, vtack, dstack} (#62560)

Summary:
Fixes https://github.com/pytorch/pytorch/issues/61767

## Changes

- [x] Add `torch.concat` alias to `torch.cat`
- [x] Add OpInfo for `cat`/`concat`
- [x] Fix `test_out` skips (Use `at::native::resize_output` or `at::native::resize_output_check`)
  - [x] `cat`/`concat`
  - [x] `stack`
  - [x] `hstack`
  - [x] `dstack`
  - [x] `vstack`/`row_stack`
- [x] Remove redundant tests for `cat`/`stack`

~I've not added `cat`/`concat` to OpInfo `op_db` yet, since cat is a little more tricky than other OpInfos (should have a lot of tests) and currently there are no OpInfos for that. I can try to add that in a subsequent PR or maybe here itself, whatever is suggested.~
**Edit**: cat/concat OpInfo has been added.

**Note**: I've added the named tensor support for `concat` alias as well, maybe that's out of spec in `array-api` but it is still useful for consistency in PyTorch.

Thanks to krshrimali for guidance on my first PR :))

cc mruberry rgommers pmeier asmeurer leofang AnirudhDagar asi1024 emcastillo kmaehashi heitorschueroff krshrimali

Pull Request resolved: https://github.com/pytorch/pytorch/pull/62560

Reviewed By: saketh-are

Differential Revision: D30762069

Pulled By: mruberry

fbshipit-source-id: 6985159d1d9756238890488a0ab3ae7699d94337