Use reactor for UserService

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Merging #2996 (91a4c97) into develop (ef8b32a) will decrease coverage by 0.07%.
The diff coverage is 57.14%.

❗ Current head 91a4c97 differs from pull request most recent head 74bd79a. Consider uploading reports for the commit 74bd79a to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2996      +/-   ##
=============================================
- Coverage      61.43%   61.36%   -0.07%     
+ Complexity      4590     4586       -4     
=============================================
  Files            556      556              
  Lines          20142    20119      -23     
  Branches        1046     1043       -3     
=============================================
- Hits           12375    12347      -28     
- Misses          7181     7192      +11     
+ Partials         586      580       -6     

Impacted Files	Coverage Δ
...a/com/faforever/client/chat/KittehChatService.java	63.03% <0.00%> (-9.84%)	⬇️
...com/faforever/client/remote/FafServerAccessor.java	80.15% <25.00%> (+5.34%)	⬆️
...in/java/com/faforever/client/user/UserService.java	75.43% <60.00%> (-5.99%)	⬇️
.../java/com/faforever/client/api/FafApiAccessor.java	92.94% <100.00%> (ø)
...va/com/faforever/client/login/LoginController.java	87.64% <100.00%> (ø)
...om/faforever/client/main/UserButtonController.java	81.81% <100.00%> (ø)

... and 2 files with indirect coverage changes

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