In Odoo 19.0+, the behavior of `odoo -i <module-name>` changed: it no longer
re-installs modules that are already installed in the database.

This creates a problem for testing auto-installable modules. Here's the sequence:

1. During database initialization, we install all dependencies of the addons
   to test using `odoo -i <dependencies>`
2. Auto-installable modules get automatically installed at this step because
   their dependencies are now satisfied
3. Later, when we run tests with `odoo -i <auto-installable-module>`, Odoo
   sees the module is already installed and skips the installation process
4. Since the module installation is skipped, its unit tests are never executed

The fix ensures that auto-installable modules are properly excluded during
the initial database setup, so they can be explicitly installed (and tested)
during the test execution phase.

To achieve this, we leverage the newly added `skip-auto-install` parameter
for Odoo 19.0+.

Fixes OCA#115