[11.x] Pass collection of models to whereMorphedTo / whereNotMorphedTo

[gdebrauwer]

The whereBelongsTo method supports providing a collection of models. This PR adds that behavior to the whereMorphedTo (and whereNotMorphedTo) method

Comment::whereMorphedTo('commentable', $posts)->get();

Comment::whereNotMorphedTo('commentable', $posts)->get();

It also supports providing a collection with different kinds of models:

Comment::whereMorphedTo('commentable', [$post, $video])->get();

Comment::whereNotMorphedTo('commentable', [$post, $video])->get();

[owenvoke]

@gdebrauwer, should this be changed to whereIn() as it's negating a negative at the moment? 🤔 We are experiencing issues with whereNotMorphedTo() on upgrading to 11.40.x

Here's a comparison of the differences:

# Previous logic (`<11.40`)
select *
from `posts`
where not (`posts`.`author_type` <=> 'user' and `posts`.`author_id` <=> 1);

# Current logic (`>=11.40`)
select *
from `posts`
where not ((`posts`.`author_type` <=> 'user' and `posts`.`author_id` not in (1)));

# Updated logic (with `whereIn()`), this logic more aligns with the previous logic
select *
from `posts`
where not ((`posts`.`author_type` <=> 'user' and `posts`.`author_id` in (1)));

I've opened a PR here: #54902