test: guide banner test coverage

[devadula-nandan]

Closes #6263

add tests to increase code coverage

What did you change?

packages/ibm-products/src/components/Guidebanner/Guidebanner.test.js

How did you test and verify your work?

yarn test codecov dashboard

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[codecov[bot]]

Codecov Report

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

Project coverage is 78.85%. Comparing base (17aeb86) to head (e532c98). Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6295      +/-   ##
==========================================
+ Coverage   78.73%   78.85%   +0.11%     
==========================================
  Files         395      395              
  Lines       12880    12880              
  Branches     4256     4256              
==========================================
+ Hits        10141    10156      +15     
+ Misses       2739     2724      -15     

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