Refactor(plugins): Move jinja test code for arista.avd.contains to PyAVD

[gmuloc]

Change Summary

cf title

Component(s) name

plugins
pyavd

Proposed changes

• Move test contains
• Add pytest
• Refactor python_wrapper

How to test

Molecule pass

Checklist

Repository Checklist

• My code has been rebased from devel before I start
• I have read the CONTRIBUTING document.
• My change requires a change to the documentation and documentation have been updated accordingly.
• I have updated molecule CI testing accordingly. (check the box if not applicable)

[github-actions]

Review docs on Read the Docs

To test this pull request:

# Create virtual environment for this testing below the current directory
python -m venv test-avd-pr-4131
# Activate the virtual environment
source test-avd-pr-4131/bin/activate
# Install all requirements including PyAVD
pip install "pyavd[ansible] @ git+https://github.com/gmuloc/avd.git@move-test-default#subdirectory=python-avd" --force
# Install Ansible collection
ansible-galaxy collection install git+https://github.com/gmuloc/avd.git#/ansible_collections/arista/avd/,move-test-default --force
# Optional: Install AVD examples
cd test-avd-pr-4131
ansible-playbook arista.avd.install_examples