fix(sidePanel): resolve storybook doc page scroll issues

[makafsal]

Closes #6623

What did you change?

1. removed unwanted storybook containers
2. confirm whether it is storybook or not before setting overflow: hidden for body

How did you test and verify your work?

storybook

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.68%. Comparing base (2f7d5f1) to head (7bbe263).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6664      +/-   ##
==========================================
- Coverage   80.78%   80.68%   -0.10%     
==========================================
  Files         396      397       +1     
  Lines       12894    12923      +29     
  Branches     4275     4286      +11     
==========================================
+ Hits        10416    10427      +11     
- Misses       2478     2496      +18     

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

[amal-k-joy]

LGTM

[matthewgallo]

The slideIn panel doesn't work as expected with these changes because the element with id ibm-products-page-content was removed.