typing: check untyped CA certificates module

[Chan-Developer]

Proposed Commit Message

chore(typing): check untyped CA certificates module

Type the heterogeneous distro configuration dictionaries and ambiguous test
values, and pass the debconf command in the list form accepted by subp.
Remove the source and test modules from the check_untyped_defs exemption.

Refs GH-5445

Additional Context

This is the unclaimed cloudinit.config.cc_ca_certs slice of GH-5445. It does not change the user interface.

Test Steps

python -m mypy cloudinit/config/cc_ca_certs.py
python -m mypy --follow-imports=skip cloudinit/config/cc_ca_certs.py tests/unittests/config/test_cc_ca_certs.py
python -m pytest -q tests/unittests/config/test_cc_ca_certs.py
python -m ruff check cloudinit/config/cc_ca_certs.py tests/unittests/config/test_cc_ca_certs.py
python -m black --check cloudinit/config/cc_ca_certs.py tests/unittests/config/test_cc_ca_certs.py
python -m isort --check-only --diff cloudinit/config/cc_ca_certs.py tests/unittests/config/test_cc_ca_certs.py
python -m pylint cloudinit/config/cc_ca_certs.py tests/unittests/config/test_cc_ca_certs.py

The focused unit suite reports 270 passed, and pylint reports 10.00/10.

Merge type

• Squash merge using Proposed Commit Message
• Rebase and merge unique commits.

[Chan-Developer]

I have now signed the Canonical Contributor Licence Agreement for the GitHub account and email associated with this contribution. The CLA check shown here is still the result from August 21, and GitHub does not allow me to rerun it as the PR author. Could a maintainer please rerun the CLA check once the signing record has synced? Thank you.