chore(side panel): code cov increase

[sangeethababu9223]

Closes #6265

Increase SidePanel code coverage to hit 80% coverage threshold

What did you change?

Updates the test cases to improve coverage

How did you test and verify your work?

Code Coverage Report

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.92%. Comparing base (eafbba3) to head (57fd397). Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6297      +/-   ##
==========================================
+ Coverage   78.68%   78.92%   +0.24%     
==========================================
  Files         395      395              
  Lines       12880    12880              
  Branches     4256     4256              
==========================================
+ Hits        10134    10165      +31     
+ Misses       2746     2715      -31     

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