ci: retain system packages for TICS workflow due to virtualenv version errors

Install system packages in TICS workflow until resolution is provided
for inability to source virtualenv path during TICS analysis.

Attempting to use tox virtualenv currently results in:

   Version string '<full_virtenv_python_path>:' too long for column
   'VersionString.Name'

Author: blackboxsw

.github/workflows/weekly-tics.yml

@@ -22,16 +22,23 @@ jobs:
 
       - name: Dependencies
         run: |
+          # TICS requires system packages insteed of virtualenvs to find
+          # pytest. Otherwise we get annotations errors about inability to
+          # find certain pylint dependencies.
+          # Attempts to use tox virtual environments result in TICS analysis
+          # failures: too long for column  VersionString.Name.
           sudo DEBIAN_FRONTEND=noninteractive apt-get -qy update
           sudo DEBIAN_FRONTEND=noninteractive apt-get -qy install tox
+          ./tools/read-dependencies                             \
+          --requirements-file requirements.txt                  \
+          --requirements-file test-requirements.txt             \
+          --system-pkg-names --distro ubuntu 2> /dev/null       \
+          | xargs sudo DEBIAN_FRONTEND=noninteractive apt-get -qy install
+
       - name: Generate coverage report and lint
         run: |
-          tox -e py3 -- tests/unittests/ --cov-report=xml:.cover/coverage.xml --color=yes
-
-          # Export tox venv python so TICS uses pinned tox dependencies.
-          tox -e pylint
-          source .tox/pylint/bin/activate
-          echo PATH=$PATH  >> $GITHUB_ENV
+          mkdir .cover
+          pytest --cov=cloudinit --cov-report=xml:.cover/coverage.xml --color=yes
 
       - name: Run TICS analysis with github-action
         uses: tiobe/tics-github-action@768de18bedf164ee461bc9ef5e2f2fa1a20b122a  # v3.7