Remove usages of applicationEventPublishers

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Merging #2371 (e740258) into develop (f682b93) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##             develop    #2371      +/-   ##
=============================================
- Coverage      62.77%   62.77%   -0.01%     
  Complexity      4095     4095              
=============================================
  Files            441      441              
  Lines          18456    18455       -1     
  Branches        1129     1129              
=============================================
- Hits           11586    11585       -1     
  Misses          6245     6245              
  Partials         625      625              

Impacted Files	Coverage Δ
...com/faforever/client/discord/DiscordJoinEvent.java	0.00% <0.00%> (ø)
...java/com/faforever/client/game/JoinGameHelper.java	72.22% <ø> (ø)
.../faforever/client/discord/DiscordEventHandler.java	35.29% <50.00%> (ø)
...forever/client/chat/MatchmakingChatController.java	77.50% <100.00%> (-0.55%)	⬇️

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