[CI] fix 4xH100 tests by not installing vllm (#2780)

[CI] fix 4xH100 tests
- This PR removes pip installing vllm from 4xH100 CI tests.
- vllm python package is only used in integration tests on 1xH100 and 1xL4 tests anyway, and should have been removed when we refactored the tests to split out 1xH100 and 4xH100

Author: danielvegamyhre

.github/workflows/4xH100_tests.yml

@@ -44,7 +44,6 @@ jobs:
         pip install uv
         pip install ${{ matrix.torch-spec }}
         uv pip install -r dev-requirements.txt
-        uv pip install vllm
         pip install .
         ./test/float8/test_everything_multi_gpu.sh
         ./test/prototype/mx_formats/test_mx_dtensor.sh