Remove runner_map

[ydshieh]

What does this PR do?

This is added when we switched from T4 to A10. We tried to do it in a progressive way but ended up doing it in one-go (after a few days) because it was confusing about the results, in particular during the debug and fix phase.

That change also caused the fsdp/traiiner job not being run due to a mistake where

echo "runner_map=$(python3 ../utils/get_runner_map.py)" >> $GITHUB_OUTPUT

is not added to the elif branch below

        run: |
          if [ "${{ inputs.job }}" = "run_models_gpu" ]; then
            echo "folder_slices=$(python3 ../utils/split_model_tests.py --models '${{ inputs.models }}' --num_splits ${{ env.NUM_SLICES }})" >> $GITHUB_OUTPUT
            echo "slice_ids=$(python3 -c 'd = list(range(${{ env.NUM_SLICES }})); print(d)')" >> $GITHUB_OUTPUT
            echo "runner_map=$(python3 ../utils/get_runner_map.py)" >> $GITHUB_OUTPUT
          elif [ "${{ inputs.job }}" = "run_trainer_and_fsdp_gpu" ]; then
            echo "folder_slices=[['trainer'], ['fsdp']]" >> $GITHUB_OUTPUT
            echo "slice_ids=[0, 1]" >> $GITHUB_OUTPUT
          fi

Since we don't need this anymore, let's just remove it.

[HuggingFaceDocBuilderDev]

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