Rename tours, reorder tests and test files, perform a quick linting of UI or tours related tests. Purpose is to prepare files to add some new tests in mass mailing. Each tour now belongs to a single file to ease maintenance and update as well as seeing feature coverage. No real change should occur with this commit except some test data (setup, test input). Prepares Task-2150462 (Mass Mailing: Improve subscription management) Part-of: odoo/odoo#122106