feat: new decorator prop for ComposedModal

[Gururajj77]

Closes #17990

Updates Composed Modal to include new decorator prop

Changelog

New

• new decorator prop, classes, and styles

Changed

• deprecated slug prop
• update rendering slug to render the decorator component but still set the size if it's an AILabel
• updated tests

Testing / Reviewing

Check dropdown with AILabel storybook and form with AILabel storybook (Composed Modal)

TODO:

• remove ComposedModal's "With Decorator" story before merging!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.20%. Comparing base (ad23c63) to head (03286f3).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18075      +/-   ##
==========================================
+ Coverage   82.14%   82.20%   +0.05%     
==========================================
  Files         404      404              
  Lines       14117    14161      +44     
  Branches     4434     4448      +14     
==========================================
+ Hits        11597    11641      +44     
+ Misses       2359     2358       -1     
- Partials      161      162       +1     

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[ariellalgilmore]

looking good just two small things

[ariellalgilmore]

looks great!! 🎉

[alisonjoseph]

LGTM!

[alisonjoseph]

This is ready to merge after removing the test story and fixing the format ci check