[5.8] Add 'index' => 'viewAny' to resourceAbilityMap

[jcqtc]

Automatically bind the viewAny method to the index controller action

[tvbeek]

First of all I think this is a nice addition.
But it breaks if you don't have a viewAny on your policy and use $this->authorizeResource(Model::class, 'model');
That result in that I'm not sure that this isn't a backward compatibility break.

Maybe it is an idea for the next time to add it more clear to the releasenotes.

[danijelk]

FYI it is a breaking change. We tried to add it last year but got rejected #26078 but glad it got through this time...

Time to update all our controller and policies :)

[jcqtc]

What if we check if the gate exists before actually adding it as a middleware ?