[Php81] Allow normal variable in trait on NullToStrictStringFuncCallArgRector

[samsonasik]

Continue on #3180

The following normal variable:

trait NormalVariableInTrait
{
    public function getTitle($title)
    {
        return trim($title);
    }
}

should be processed to :

-return trim($title);
+return trim((string) $title);

[TomasVotruba]

Good one 👍 Go for the merge ✔️

[samsonasik]

I rolled back property assigned in trait construct that was processed on #3173 to be skipped back, while __construct() method can be overridden by class that consume the trait, the use case seems very rare, so skip seems make sense:

241204c

[samsonasik]

The MethodCall or possibly StaticCall detection as FuncCall argument may be in next iteration for improvement where the result is Typed and actually non-mixed type, eg: Nullable type.

[samsonasik]

I am merging it ;)