[backend] Improve Mastodon logs (#3902)

[damgouj]

Proposed changes

• Improve Mastodon injector logs

Related issues

• Closes Improve Mastodon injector logs #3902

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[codecov]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.62%. Comparing base (06a9887) to head (ac1538f).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...as/injectors/mastodon/service/MastodonService.java	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3903      +/-   ##
============================================
- Coverage     46.78%   44.62%   -2.16%     
+ Complexity     3525     2881     -644     
============================================
  Files           812      779      -33     
  Lines         28522    23717    -4805     
  Branches       2366     1684     -682     
============================================
- Hits          13343    10584    -2759     
+ Misses        14450    12525    -1925     
+ Partials        729      608     -121     

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