Add ability to disable RelationManager list edit action

[mallardduck]

This just adds a very simple method to complement the canCreate, canDelete, and canDetach methods. The benefit of this is a very easy way to make the relation manager only allow attach and detach actions.

[monoman81]

I made the same question earlier today on the filament discord server. What i have to do is this:

use Filament\Resources\RelationManager\ListRecords;
class ListMediaRecords extends ListRecords
{
    public function getRecordActions()
    {
        return [
        ];
    }
}

And in the RelationManager class override the $components static variable to tell filament that use my custom ListMediaRecords:

protected static $components = [
        'attach' => RelationManager\AttachRecord::class,
        'create' => CreateMediaRecord::class,
        'edit' => RelationManager\EditRecord::class,
        'list' => ListMediaRecords::class,
];

It works but seems to me a little bit of overkill if only need to remove the Edit action.

[mallardduck]

@monoman81 - Thanks for providing that input, I think this helps to show how this PR could be a simpler alternative to that method. This method will also make the control of edit abilities match the others as mentioned in my OP.

[monoman81]

I agree with you. Regards.

[danharrin]

Thank you!