Implement visibility for the components groups. Closes#1892
Add functional test that asserts a guest can only see public items.
* Fix tests not running due to hitting the Setup page.
The missing `boostrap/cachet/testing.php` file is now generated the first time tests are ran.
* Add a functional test that asserts logged in users can see all items.
Add constants for possible values for the visible column/field of the ComponentGroup model.
Code review changes.
* Add API tests for component group visibility feature.
* Implement the visibility hidden option for a component group. Fixes#1892.
Add migration for the created_by column, in component_groups table.
Add methods to the ComponentGroup and User models to be able to work with the created_by column.
Hidden component groups are no longer displayed on the index page for loggedin users.
Add functional test for the dashboard page.
Save owner on create/edit component group.
Update the API tests for Component group visibility feature.
* Replace auth() usage with app(Guard::class).
* Apply StyleCI fixes.
* Drop the hidden visibility feature and fix all tests.
Some code review fixes too.
* Rename public to visible since it's a reserved keyword. Apply StyleCI fixes and correct typo.
* Code review changes.
* Tidy up component and component groups gathering.
* Code review changes and StyleCI fixes.
* Code review changes.
* Remove extra whitespace
* Remove useless method.
