#5848: FontHandler log entries at debug level

[SJuliez]

Since the FontHandler log entries (could not register font ...) usually only mean that a font is already installed at system level, this changes their report level to DEBUG so they don't usually appear in the log.

Fix #5848

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.97%. Comparing base (a55a508) to head (b1db2cd).
Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5858      +/-   ##
============================================
- Coverage     28.99%   28.97%   -0.02%     
+ Complexity    13930    13905      -25     
============================================
  Files          2512     2512              
  Lines        267289   267291       +2     
  Branches      47837    47837              
============================================
- Hits          77510    77458      -52     
- Misses       185829   185879      +50     
- Partials       3950     3954       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.