[9.x] Share WithoutOverlapping key across jobs

[timacdonald]

This PR allows WithoutOverlapping to apply across different job classes. Currently this feature only allows without overlapping to be applied to instances of a single class.

use Illuminate\Queue\Middleware\WithoutOverlapping;

class ProviderIsDown
{
    // ...


    public function middleware()
    {
        return [
            (new WithoutOverlapping("provider-status:{$this->provider}"))->shareKey(),
        ];
    }
}

class ProviderIsUp
{
    // ...


    public function middleware()
    {
        return [
            (new WithoutOverlapping("provider-status:{$this->provider}"))->shareKey(),
        ];
    }
}

These two jobs will now not overlap even though they are different classes. They both utilise the same lock key (assuming the provider is the same) `"provider-status:{providerName}".

Thanks @andrewbroberg for raising and chatting to me about this.

Documentation PR: laravel/docs#8240

[rihardsgrislis]

Hah, I ran into the same constraint earlier last week and wanted to contribute but you beat me to it. 😄
Thanks!

[timacdonald]

No troubles! Glad to hear it will be useful :)