feat: On lists, ensure to always add new items to the top

[g123k]

Hi everyone,

Still as part of #3986, on lists (labels, categories…), we currently append new items to the bottom.
When we have 10+ items, it's pretty difficult to know if the item is added or not.

To simplify things, the UI will now show the new items on top of the list, but internally, they still be added to the end.

As always, a video is better than words: custom_sort.webm

[codecov-commenter]

Codecov Report

Merging #4211 (ea15250) into develop (6ce7f75) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4211      +/-   ##
===========================================
- Coverage    11.23%   11.23%   -0.01%     
===========================================
  Files          277      277              
  Lines        13694    13698       +4     
===========================================
  Hits          1539     1539              
- Misses       12155    12159       +4     

Impacted Files	Coverage Δ
...ges/smooth_app/lib/helpers/collections_helper.dart	12.50% <0.00%> (-0.55%)	⬇️
...oth_app/lib/pages/product/simple_input_widget.dart	0.00% <0.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[teolemon]

Nice touch 👍