Fix: Change the required arguments for eos_cli_config_gen action plugin

[gmuloc]

Change Summary

For people using the arista.avd.eos_cli_config_gen action plugin directly some

Component(s) name

plugins arista.avd.eos_cli_config_gen

Proposed changes

Leverage required_if for config, structured_config and documentation filenames

How to test

Tested locally using argspec

Checklist

Repository Checklist

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

[github-actions[bot]]

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-4152
# Activate the virtual environment
source test-avd-pr-4152/bin/activate
# Install all requirements including PyAVD
pip install "pyavd[ansible] @ git+https://github.com/gmuloc/avd.git@fix-eos-cli-config-argument-spec#subdirectory=python-avd" --force
# Install Ansible collection
ansible-galaxy collection install git+https://github.com/gmuloc/avd.git#/ansible_collections/arista/avd/,fix-eos-cli-config-argument-spec --force
# Optional: Install AVD examples
cd test-avd-pr-4152
ansible-playbook arista.avd.install_examples