[9.x]  Unset Connection Resolver extended callback (#41216)
[9.x]  Unset Connection Resolver extended callback (#41216)

* Unset Connection Resolver extended callback

* Removed isset()

* Update DatabaseManager.php

Co-authored-by: Taylor Otwell <5d74ae093a16a00e5af127763f2dc7e13988f162@laravel.com>
lucasmichot/framework,samlev/framework,hafezdivandari/framework,JamesForks/framework,dwightwatson/framework,laravel/framework,leo108/laravel_framework,arturock/framework,lucasmichot/framework,laravel/framework,leo108/laravel_framework,driesvints/framework,dwightwatson/framework,hafezdivandari/framework,arturock/framework,samlev/framework,JamesForks/framework,arturock/framework,morrislaptop/framework,driesvints/framework,morrislaptop/framework