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[CK] Remove duplicated XDL/WMMA tests
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## Motivation
When we started the RDNA4 support, the XDL instances were not supporting
WMMA instructions, so we duplicated some tests.
In this issue, we simplified most of the duplicated test files into
common test files.
## Technical Details
The following tests were unified:
- `batched_gemm`
- `batched_gemm_gemm`
- `gemm_add`
- `gemm_universal`
- `grouped_convnd_bwd_data`
The following tests were duplicated exactly, and copied into two files
with `_xdl` and `_wmma` suffixes. Now they are unified in one single
file without suffix:
- `gemm_multi_abd`
- `gemm_b_scale`
There is still an apparent duplication which is a special case, namely
`test_grouped_convnd_bwd_weight_interface_{suffix}` where `{suffix}` is
`xdl` or `wmma`.
However, the WMMA code relies on an old implementation, and is expected
to be removed in the future. In addition, it differs from the XDL
implementation significantly.
Therefore, it was decided to keep both files separate instead of
attempting any unification.
## Test Plan
`CMakeLists.txt` files were modified to support the new, unified tests.
In particular, testing was done for `gfx90a`, `gfx1201` and `gfx11`
architectures.
## Test Result
All tests passed successfully on all three tested architectures.
## Submission Checklist
- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.