test: remove obsolete image.urlPlaceholder integration test

[ST-DDT]

Removes the integration test for the image.urlPlaceholder function that no longer produces working links and thus fails our periodic integration tests.

• refactor(image): deprecate urlPlaceholder #3341

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (9c42195) to head (07500ba).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3392   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files        2811     2811           
  Lines      216965   216965           
  Branches      941      940    -1     
=======================================
  Hits       216914   216914           
  Misses         51       51