[CI] Remove mi355 job after the runner was removed (#24632)

The runner got moved to a different project. This removes the job to not
run into timeouts on main all the time.
diff --git a/.github/workflows/pkgci.yml b/.github/workflows/pkgci.yml
index b5ff657..0fd37ce 100644
--- a/.github/workflows/pkgci.yml
+++ b/.github/workflows/pkgci.yml
@@ -52,12 +52,6 @@
     if: contains(fromJson(needs.setup.outputs.enabled-jobs), 'test_amd_mi325')
     uses: ./.github/workflows/pkgci_test_amd_mi325.yml
 
-  test_amd_mi355:
-    name: Test AMD MI355
-    needs: [setup, build_packages]
-    if: contains(fromJson(needs.setup.outputs.enabled-jobs), 'test_amd_mi355')
-    uses: ./.github/workflows/pkgci_test_amd_mi355.yml
-
   test_amd_w7900:
     name: Test AMD W7900
     needs: [setup, build_packages]
diff --git a/.github/workflows/pkgci_test_amd_mi355.yml b/.github/workflows/pkgci_test_amd_mi355.yml
deleted file mode 100644
index c1c99ab..0000000
--- a/.github/workflows/pkgci_test_amd_mi355.yml
+++ /dev/null
@@ -1,95 +0,0 @@
-# Copyright 2026 The IREE Authors
-#
-# Licensed under the Apache License v2.0 with LLVM Exceptions.
-# See https://llvm.org/LICENSE.txt for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-name: PkgCI Test AMD MI355
-permissions:
-  contents: read
-on:
-  workflow_call:
-    inputs:
-      artifact_run_id:
-        type: string
-        default: ""
-  workflow_dispatch:
-    inputs:
-      artifact_run_id:
-        type: string
-        default: ""
-
-jobs:
-  test_mi355:
-    runs-on: linux-mi35x-1gpu-ossci-iree-org
-    timeout-minutes: 60
-    env:
-      PACKAGE_DOWNLOAD_DIR: ${{ github.workspace }}/.packages
-      BUILD_DIR: build-tests
-      VENV_DIR: ${{ github.workspace }}/.venv
-      GH_TOKEN: ${{ github.token }}
-      IREE_CPU_DISABLE: 1
-      IREE_VULKAN_DISABLE: 1
-      IREE_CUDA_ENABLE: 0
-      IREE_HIP_ENABLE: 1
-      IREE_ROCM_TEST_TARGET_CHIP: "gfx950"
-    container:
-      image: rocm/dev-ubuntu-24.04:7.2
-      options: --ipc host
-        --group-add video
-        --device /dev/kfd
-        --device /dev/dri
-    defaults:
-      run:
-        shell: bash
-    steps:
-      - name: Install dependencies
-        run: |
-          apt-get update
-          apt-get install -y git cmake ninja-build
-      - name: Configure git
-        run: git config --global --add safe.directory '*'
-      - name: Check out repository
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
-        with:
-          submodules: false
-      - name: Check out runtime submodules
-        run: ./build_tools/scripts/git/update_runtime_submodules.sh
-      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-        with:
-          python-version: "3.11"
-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
-        if: ${{ inputs.artifact_run_id == '' }}
-        with:
-          name: linux_x86_64_release_packages
-          path: ${{ env.PACKAGE_DOWNLOAD_DIR }}
-      - name: Setup base venv
-        run: |
-          ./build_tools/pkgci/setup_venv.py ${VENV_DIR} \
-            --artifact-path=${PACKAGE_DOWNLOAD_DIR} \
-            --fetch-gh-workflow=${{ inputs.artifact_run_id }}
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - name: Display environment info
-        run: |
-          echo "=== ROCm Version ==="
-          cat /opt/rocm/.info/version || echo "version file not found"
-          echo ""
-          echo "=== Kernel Version ==="
-          uname -r
-          echo ""
-          echo "=== rocminfo ==="
-          rocminfo || echo "rocminfo not available"
-      - name: Build tests
-        run: ./build_tools/pkgci/build_tests_using_package.sh ${VENV_DIR}/bin
-      - name: Run GPU tests
-        env:
-          CTEST_PARALLEL_LEVEL: 2
-          IREE_CTEST_LABEL_REGEX: ^requires-gpu|^driver=hip$
-          IREE_AMD_CDNA3_TESTS_DISABLE: 1
-          IREE_AMD_CDNA4_TESTS_DISABLE: 0
-          IREE_AMD_RDNA3_TESTS_DISABLE: 1
-          IREE_NVIDIA_GPU_TESTS_DISABLE: 0
-          IREE_NVIDIA_SM80_TESTS_DISABLE: 1
-          IREE_MULTI_DEVICE_TESTS_DISABLE: 0
-        run: ./build_tools/cmake/ctest_all.sh ${BUILD_DIR}