chore(lint): enable and fix no-unused-vars

[max-nextcloud]

handleNotifyPush was not called at all.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.63%. Comparing base (2dc2689) to head (88f3339).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7450      +/-   ##
==========================================
+ Coverage   52.70%   59.63%   +6.92%     
==========================================
  Files         495      494       -1     
  Lines       42284    37367    -4917     
  Branches     1089     1088       -1     
==========================================
- Hits        22284    22282       -2     
+ Misses      19893    14979    -4914     
+ Partials      107      106       -1     

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