test(useravatar): add test

[anamikaanu96]

Closes #6791

Add test for user avatar web component

What did you change? packages/ibm-products-web-components/src/components/user-avatar/user-avatar.test.ts

How did you test and verify your work? yarn test and yarn coverage

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.75%. Comparing base (ccb1295) to head (cfdded3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7035   +/-   ##
=======================================
  Coverage   81.74%   81.75%           
=======================================
  Files         399      399           
  Lines       12970    12970           
  Branches     4269     4269           
=======================================
+ Hits        10602    10603    +1     
+ Misses       2368     2367    -1     

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

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[davidmenendez]

terrific!