feat(AvatarStack): Convert AvatarStack to CSS modules behind team feature flag (#5299)

* Convert AvatarStack to CSS modules behind primer_react_css_modules_team feature flag

* Updating the tests to run with the feature flag on

* Create hot-chicken-tickle.md

* Fix tests

* Update hot-chicken-tickle.md

Co-authored-by: Josh Black <joshblack@github.com>

* Quiet warnings

* Update CSS disables

* Remove feature flag change

* Revert package changes

* Revert module changes

* Add span element to AvatarStackWrapper

* Update snapshot

* Fix weird merge problem

* important on the box shadow until avatar removes sx

* Update snapshot

* Reduce diff

* Move AvatarStackBody out of AvatarStack

* Move space

* Fix to make sure sx prop is being passed in

* Not important

* Add a link wrapper test

* Adjust css for when link wrapper occurs

* test(vrt): update snapshots

* Update snap

* Remove box-shadow

* Apply suggestions from code review

Co-authored-by: Marie Lucca <40550942+francinelucca@users.noreply.github.com>
Co-authored-by: Hussam Ghazzi <hussam-i-am@github.com>

---------

Co-authored-by: Josh Black <joshblack@github.com>
Co-authored-by: jonrohan <jonrohan@users.noreply.github.com>
Co-authored-by: Marie Lucca <40550942+francinelucca@users.noreply.github.com>
Co-authored-by: Hussam Ghazzi <hussam-i-am@github.com>

Author: 4 people

.changeset/hot-chicken-tickle.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+Update `AvatarStack` component to use CSS modules behind the feature flag primer_react_css_modules_team