feat(sidepanel): implement decorator prop

[makafsal]

Closes #6454

What did you change?

implemented a new prop decorator and deprecated aiLabel

How did you test and verify your work?

yarn test
storybook

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.85%. Comparing base (9f31fc3) to head (754fc10).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6511   +/-   ##
=======================================
  Coverage   79.85%   79.85%           
=======================================
  Files         394      394           
  Lines       12877    12878    +1     
  Branches     4258     4258           
=======================================
+ Hits        10283    10284    +1     
  Misses       2594     2594           

Components	Coverage Δ
ibm-products	∅ <ø> (∅)
ibm-products-web-components	∅ <ø> (∅)