Add visibility to component groups (#2027)

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.

app/Bus/Handlers/Commands/ComponentGroup/AddComponentGroupCommandHandler.php

@@ -30,6 +30,7 @@ class AddComponentGroupCommandHandler
             'name'      => $command->name,
             'order'     => $command->order,
             'collapsed' => $command->collapsed,
+            'visible'   => $command->visible,
         ]);
 
         event(new ComponentGroupWasAddedEvent($group));