Use uv for python packages install

uv should show significant performance improvement, especially without
wheels being pre-built.

Depends-On: https://review.opendev.org/c/openstack/ansible-role-python_venv_build/+/966338
Change-Id: If98c55150a2362ed0d377374ecd3ffd8ddfd871e
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>

global-requirement-pins.txt

@@ -10,3 +10,4 @@ pip==26.0.1
 wheel==0.46.3
 setuptools==80.10.2
 uWSGI==2.0.31
+uv==0.9.7

tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2

@@ -229,6 +229,7 @@ magnum_wsgi_processes: 1
 magnum_conductor_workers: 1
 
 {% if 'metal' in bootstrap_host_scenarios %}
+venv_install_tool: uv
 venv_wheel_build_enable: false
 {% endif %}