Feat(eos_designs): Enable evpn_gateway for pathfinder deployment

[ayushmittal-arista]

Change Summary

Allow configuring evpn_gateway on wan_router

Related Issue(s)

Component(s) name

arista.avd.<role-name>

Proposed changes

• Moved hosts file leaf-wan-use-evpn-on-lan, cv-pathfinder-edge-wan-use-evpn-on-lan under SITE_EVPN in eos_designs_unit_tests
• Testing the case of client directly connected to a spine.

How to test

molecule

Checklist

User Checklist

• N/A

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-5082
# Activate the virtual environment
source test-avd-pr-5082/bin/activate
# Install all requirements including PyAVD
pip install "pyavd[ansible] @ git+https://github.com/ayushmittal-arista/ayush-avd.git@a_4865_12#subdirectory=python-avd" --force
# Point Ansible collections path to the Python virtual environment
export ANSIBLE_COLLECTIONS_PATH=$VIRTUAL_ENV/ansible_collections
# Install Ansible collection
ansible-galaxy collection install git+https://github.com/ayushmittal-arista/ayush-avd.git#/ansible_collections/arista/avd/,a_4865_12 --force
# Optional: Install AVD examples
cd test-avd-pr-5082
ansible-playbook arista.avd.install_examples