Do not fail when the input isn't valid UTF-8

[julienw]

Because we accept arbitrary strings in markers, having non-valid UTF-8 could happen sometimes (even though this would be a bug in Firefox). But with the current code this fails the whole import. Instead we can try to be more gentle and accept the profile still.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.03%. Comparing base (90bb6f3) to head (b287631).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5426   +/-   ##
=======================================
  Coverage   86.03%   86.03%           
=======================================
  Files         312      312           
  Lines       30365    30365           
  Branches     8299     8299           
=======================================
  Hits        26126    26126           
  Misses       3645     3645           
  Partials      594      594           

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