[Build] Remove unused tools/install_deepgemm.sh (#61265)

Signed-off-by: Tyler Michael Smith <tlrmchlsmth@gmail.com>
Co-authored-by: Codex <noreply@openai.com>
Co-authored-by: Misha Goin <mgoin64@gmail.com>
Co-authored-by: Kevin H. Luu <khluu000@gmail.com>

.buildkite/test_areas/kernels.yaml

@@ -545,7 +545,6 @@ steps:
   num_devices: 1
   source_file_dependencies:
   - cmake/external_projects/deepgemm.cmake
-  - tools/install_deepgemm.sh
   - tools/build_deepgemm_C.py
   - tools/setup_deepgemm_pythons.sh
   - tools/check_wheel_deepgemm.py