fix: allows policy result in after check callbacks as mentioned in docs

[bhushan]

As mentioned in the docs, we can override results after the checks has been passed in after callback checks.

https://laravel.com/docs/11.x/authorization#intercepting-gate-checks

Scenario:

• in my project I want to first check if user is allowed to access some api or not, and that is all resolved by default using sanctum.
• now in after check, I want to fire up extra sql queries to make sure initial checks are passed.

[taylorotwell]

We actually have tests specifically preventing this, so we may want to adjust the docs instead.

[bhushan]

I see based on failing test cases, it is intentional, but we want to still override results even if it is true, so if we both are on same page, I can fix test cases for this PR, please let me know.

also if you do not agree with this, then please help me how i can do this