CsvMapper: Change Obsoleted ActivatorContent to CustomContent

[mckaragoz]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.42%. Comparing base (d0ae598) to head (f628133).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #647      +/-   ##
==========================================
+ Coverage   65.39%   65.42%   +0.02%     
==========================================
  Files         111      111              
  Lines        8384     8384              
  Branches     1480     1480              
==========================================
+ Hits         5483     5485       +2     
+ Misses       2394     2391       -3     
- Partials      507      508       +1     

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