`update_esi_fatlinks` task chain improved

[ppfeufer]

Description

Changed

• update_esi_fatlinks task chain improved, so the sub-task process_character is only fired for new pilots in the fleet, not for every pilot

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #220 (7bc2e4a) into master (5fb6d0e) will increase coverage by 0.27%. The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   66.91%   67.19%   +0.27%     
==========================================
  Files          22       22              
  Lines        1203     1198       -5     
  Branches      172      172              
==========================================
  Hits          805      805              
+ Misses        378      373       -5     
  Partials       20       20              

Impacted Files	Coverage Δ
afat/tasks.py	38.29% <10.00%> (+1.93%)	:arrow_up:
afat/__init__.py	100.00% <100.00%> (ø)

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