[9.x] Fixes 45582 issue 🔧

[imanghafoori1]

This fixes #45582
Since the Builder\Query flattens the binding array before applying it a method like whereIn can accept an associative array as its second argument (as demonstrated in the added tests).
So to make whereIntegerInRaw compatible with whereIn we need to flatten the values before casting it to int.
@staudenmeir

• Missing tests are added.

• The whereIn method tries to avoid accepting nested arrays as $values with the check below, but it is not enough and can be bypassed with an input like this:

 ->whereIn('id', [
     ['id' => 1 ], 
     ['id' => 2 ]
 ]) 

and due to the above flattening, it will continue to work as if it was called like this:

->whereIn('id', [1, 2])