Remove test_punet job from ci-sharktank.yml. (#621)

Partial revert of #613.

This job takes over an hour to run (specifically
`test_punet_eager_fp16_validation `) and is not suitable for presubmit.

This is likely also not the right file for such tests, and if it was
then the specialized tests should go under the generic `test` job, not
at the top of the file.

.github/workflows/ci-sharktank.yml

@@ -22,45 +22,6 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  test_punet:
-    name: "Integration Tests - punet"
-    runs-on: nodai-amdgpu-mi250-x86-64
-    env:
-      PIP_CACHE_DIR: "${{ github.workspace }}/.pip-cache"
-    steps:
-      - name: "Setting up Python"
-        id: setup_python
-        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
-        with:
-          python-version: 3.11
-
-      - name: "Checkout Code"
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - name: Cache Pip Packages
-        uses: actions/cache@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
-        id: cache-pip
-        with:
-          path: ${{ env.PIP_CACHE_DIR }}
-          key: pip-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('*requirements*.txt','sharktank/requirements*.txt') }}
-
-      - name: Install pip deps
-        run: |
-          python -m pip install --no-compile --upgrade pip
-          # Note: We install in three steps in order to satisfy requirements
-          # from non default locations first. Installing the PyTorch CPU
-          # wheels saves multiple minutes and a lot of bandwidth on runner setup.
-          pip install --no-compile -r pytorch-cpu-requirements.txt
-          pip install --no-compile -r requirements.txt -r sharktank/requirements-tests.txt -e sharktank/
-
-          # Update to the latest iree packages.
-          pip install -f https://iree.dev/pip-release-links.html --upgrade --pre \
-            iree-base-compiler iree-base-runtime --src deps \
-            -e "git+https://github.com/iree-org/iree-turbine.git#egg=iree-turbine"
-      - name: Run punet tests
-        run: |
-          pytest -v sharktank/ -m model_punet
-
   test:
     name: "Unit Tests and Type Checking"
     strategy: