🐛 [NO-TICKET] Migrate scroll to last item

[MCR19]

This PR migrates recent scrollToLastItem fixes in MessageKit. This is to fix crashes when the MessagesCollectionView tries to scroll to the last item in the collection view and the collection view is either still in a layout or reload cycle.

The first fix was added here, previous scroll logic was deprecated here and then finally improved here

Here's the MessageKit changelog for reference

[timmikeljmonzo]

Did you have a chance to test this @MCR19?

[timmikeljmonzo]

did you just cherry pick those changes from main MessageKit repo out of interest?

[MCR19]

Did you have a chance to test this @MCR19?

I have @timmikeljmonzo and looks to be working as expected. The scrolling to the beginning of the chat issue is tricky to replicate so will likely have to ask the customer experiencing the issue to confirm any fixes.

I'm also planning to put any changes behind a feature flag.

[MCR19]

did you just cherry pick those changes from main MessageKit repo out of interest?

I didn't no, as the logic I wanted was split over multiple commits. There is also changes in some of the commits that we don't support in our fork. Would it be better for me to cherry pick them?