CI: Minor updates to GitHub workflows

[ClausHolbechArista]

• Set PY_COLORS and ANSIBLE_FORCE_COLOR once in each workflow file.
• Add python3.13 to ansible-test job.

[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-4740
# Activate the virtual environment
source test-avd-pr-4740/bin/activate
# Install all requirements including PyAVD
pip install "pyavd[ansible] @ git+https://github.com/ClausHolbechArista/avd.git@ci/minor-updates-to-workflows#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/ClausHolbechArista/avd.git#/ansible_collections/arista/avd/,ci/minor-updates-to-workflows --force
# Optional: Install AVD examples
cd test-avd-pr-4740
ansible-playbook arista.avd.install_examples

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud