remove unsafe workflow. (#7967)

.github/workflows/run_test_from_pr.yml

-name: Run (SLOW) desired tests on our runner from a PR (applicable to GPUs only at the moment)
-
-on:
-  workflow_dispatch:
-    inputs:
-      pr_number: 
-        description: 'PR number'
-        required: true
-      docker_image:
-        default: 'diffusers/diffusers-pytorch-cuda'
-        description: 'Name of the Docker image'
-        required: true
-      test_command:
-        description: 'Test command to run (e.g.: `pytest tests/pipelines/dit/`). Any valid pytest command can be provided.'
-        required: true
-
-env:
-  IS_GITHUB_CI: "1"
-  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-  HF_HOME: /mnt/cache
-  DIFFUSERS_IS_CI: yes
-  OMP_NUM_THREADS: 8
-  MKL_NUM_THREADS: 8
-  RUN_SLOW: yes
-
-jobs:
-  run_tests:
-    name: "Run a test on our runner from a PR"
-    runs-on: [single-gpu, nvidia-gpu, "t4", ci]
-    container:
-      image: ${{ github.event.inputs.docker_image }}
-      options: --gpus all --privileged --ipc host -v /mnt/cache/.cache/huggingface:/mnt/cache/
-
-    steps:
-      - name: NVIDIA-SMI
-        run: |
-          nvidia-smi
-
-      - uses: actions/checkout@v3
-      - name: Install `gh`
-        run: | 
-            : # see https://github.com/cli/cli/blob/trunk/docs/install_linux.md#debian-ubuntu-linux-raspberry-pi-os-apt 
-            (type -p wget >/dev/null || (apt update && apt-get install wget -y)) \
-            && mkdir -p -m 755 /etc/apt/keyrings \
-            && wget -qO- https://cli.github.com/packages/githubcli-archive-keyring.gpg | tee /etc/apt/keyrings/githubcli-archive-keyring.gpg > /dev/null \
-            && chmod go+r /etc/apt/keyrings/githubcli-archive-keyring.gpg \
-            && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" | tee /etc/apt/sources.list.d/github-cli.list > /dev/null \
-            && apt update \
-            && apt install gh -y
-      
-      - name: Checkout the PR branch
-        run: |
-          gh pr checkout ${{ github.event.inputs.pr_number }}
-      
-      - name: Run tests
-        run: ${{ github.event.inputs.test_command }}
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