Fix missing alias in soft deletes in oneThrough / manyThrough / morphOne / morphMany

[marickvantuil]

In a hasOneThrough/hasManyThrough relation, it would not apply an alias to the related table.

class Comment # 1: farParent
{
    public function postCategory(): HasOneThrough
    {
                                  # 2: related       3: through
        return $this->hasOneThrough(Category::class, Post::class);
    }
}

Instead, it would look for a potential alias of the 'farParent' but I think this is unintentional. It should look for alias in the 'through' relation (it already did that) and the 'related' relation (it does after this change)

Second fix is for #209 and applies missing alias in soft deletes for morphOne/morphMany.

PS, i added a new Like model because I need to test soft deletes. I didn't want to add SoftDeletes to another model because it would mean many existing tests needed to be changed.

[marickvantuil]

Happy to help with any additional work needed to get this merged. If more tests are necessary let me know.

[luisdalmolin]

Great, thanks for the additional tests making sure things work. I'll get this reviewed but I think this change makes sense.