Remove "basic" and universal GEMM tests, and incorporate their test cases into the GEMM pipeline tests

[SamiAario-AMD]

Proposed changes

The "basic" GEMM tests do not test the basic GEMM (pipelines V1 and V2), but rather the V3 pipeline, which is tested by the universal GEMM tests. As for the universal GEMM tests, they have overlapping coverage with the GEMM pipeline tests. The pipeline tests, on the other hand, offer more test coverage per parameter set. Therefore remove the "basic" and universal GEMM tests, and incorporate their test cases into the GEMM pipeline tests.

Checklist

Please put an x into the boxes that apply. You can also fill these out after creating the PR. If you're not sure, please don't hesitate to ask.

• I have added tests relevant to the introduced functionality, and the unit tests are passing locally
• I have added the test to REGRESSION_TESTS list defined at the top of CMakeLists.txt in tests/CMakeLists.txt, IF the test takes more than 30 seconds to run.
• I have added inline documentation which enables the maintainers with understanding the motivation
• I have removed the stale documentation which is no longer relevant after this pull request
• (If this change is user-facing) I have added release notes which provide the end users with a brief summary of the improvement from this pull request
• I have run clang-format on all changed files
• Any dependent changes have been merged

Discussion

If this is a relatively large or complex change, feel free to start a discussion by explaining why you chose the solution you did and what alternatives you considered