actions: Address some of the TICS failures

There are some errors in the TICS job, even though the job passes. Some
of these errors relate to some missing dependencies for pylint.

There is one other notable type of error (hundreds of errors), related
to Coverity:

[ERROR 5336] No analysis data found for file '/home/runner/work/k8s-snap/k8s-snap/src/k8s/pkg/k8sd/controllers/csrsigning/const.go' in 'Coverity'. Please check if the file is analyzed properly, and whether the file is in the analysis scope of the tool.

These errors are currently unsolvable. The current version of TICS comes
with the Coverity 2024.9.0 version (as seen in cov-build-console.log):

Coverity Build Capture (64-bit) version 2024.9.0 on Linux 6.8.0-1020-azure x86_64
Internal version numbers: 950e903b4e p-2024.9-push-30

According to the Coverity documentation [1], this version of Coverity
only supports golang 1.21 and 1.22, while this project is built on
golang 1.23. Coverity 2024.12.0 supports golang 1.23 as well.

[1] https://documentation.blackduck.com/bundle/coverity-on-polaris-UAT/page/topics/r_coverity-compatible-platforms_2024.9.html

.github/workflows/nightly-test.yaml

@@ -81,6 +81,11 @@ jobs:
           # Install python dependencies
           pip install -r tests/integration/requirements-test.txt
           pip install -r tests/integration/requirements-dev.txt
+          # Needed by pylint (TICSQServer), used in build-scripts, k8s/scripts/cis
+          pip install requests jinja2 semver
+
+          # Integration tests are importing a local test_util module. Needed for pylint.
+          export PYTHONPATH="$(pwd)/tests/integration/tests"
 
           cd src/k8s