ci: get rid of integration tests - broken, unmaintained

The container based integration tests are broken and
unmaintained.  We don't need them anymore anyway.

If you want to run tests in a container, use tox-lsr.
https://github.com/linux-system-roles/tox-lsr?tab=readme-ov-file#container-testing

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

.github/workflows/integration.yml

@@ -1,30 +0,0 @@
-name: integration
-
-on:
-  pull_request:
-    types: [opened, synchronize, reopened]
-  merge_group:
-    branches:
-      - main
-    types:
-      - checks_requested
-  push:
-    branches:
-      - main
-
-jobs:
-  integration:
-    runs-on: ubuntu-20.04
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: "c7"
-          - os: "c8s"
-          - os: "c9s"
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Run tests
-        run: sudo .github/run_test.sh --os ${{ matrix.os }}