ci: Remove the SGX worker

The SGX worker needs to be removed together with the retirement of the
underline bare-metal system.

Signed-off-by: Bo Chen <chen.bo@intel.com>

.github/workflows/integration-sgx.yaml

@@ -1,32 +0,0 @@
-name: Cloud Hypervisor Tests (SGX)
-on: [merge_group, pull_request]
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build:
-    name: Tests (SGX)
-    runs-on: ${{ github.event_name == 'pull_request' && 'ubuntu-latest' || 'jammy-sgx' }}
-    env:
-      AUTH_DOWNLOAD_TOKEN: ${{ secrets.AUTH_DOWNLOAD_TOKEN }}
-    steps:
-      - name: Fix workspace permissions
-        if: ${{ github.event_name != 'pull_request' }}
-        run: sudo chown -R github-runner:github-runner ${GITHUB_WORKSPACE}
-      - name: Code checkout
-        if: ${{ github.event_name != 'pull_request' }}
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - name: Run SGX integration tests
-        if: ${{ github.event_name != 'pull_request' }}
-        timeout-minutes: 10
-        run: scripts/dev_cli.sh tests --integration-sgx
-      - name: Run SGX integration tests for musl
-        if: ${{ github.event_name != 'pull_request' }}
-        timeout-minutes: 10
-        run: scripts/dev_cli.sh tests --integration-sgx --libc musl
-      - name: Skipping build for PR
-        if: ${{ github.event_name == 'pull_request' }}
-        run: echo "Skipping build for PR"