Removed deprecated recommendations endpoint calls from Hardcover pro…

[busliggabor]

Fixes the following issue: #1051
Removed the recommended part from Hardcover provider, along with the unit tests belonging to that part of the code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.93%. Comparing base (49be3f0) to head (315382b).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1052      +/-   ##
==========================================
- Coverage   82.94%   82.93%   -0.02%     
==========================================
  Files          69       69              
  Lines        6997     6992       -5     
==========================================
- Hits         5804     5799       -5     
  Misses       1193     1193              

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[FuzzyGrim]

Thanks for the PR!