[11.x] Add withWhereRelation method to builder

[utsavsomaiya]

class Consumer extends Model
{
    public function company(): BelongsTo
    {
        return $this->belongsTo(Company::class)->withTrashed();
    }
}

Consumer::query()
-    ->withWhereHas('company', function (Builder|BelongsTo $query): void {
-       $query->whereNull('deleted_at');
-   })
+    ->withWhereRelation('company', 'deleted_at' null);