Simplify notification service

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Merging #3087 (4b45968) into develop (7e1f13d) will increase coverage by 0.00%.
The diff coverage is 29.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #3087   +/-   ##
==========================================
  Coverage      59.07%   59.08%           
+ Complexity      4422     4409   -13     
==========================================
  Files            560      562    +2     
  Lines          20187    20151   -36     
  Branches        1021     1013    -8     
==========================================
- Hits           11926    11906   -20     
+ Misses          7721     7707   -14     
+ Partials         540      538    -2     

Files	Coverage Δ
...forever/client/chat/AbstractChatTabController.java	71.75% <ø> (ø)
...java/com/faforever/client/coop/CoopController.java	58.62% <100.00%> (ø)
...java/com/faforever/client/fa/GameFullNotifier.java	87.50% <ø> (ø)
...orever/client/fx/contextmenu/AbstractMenuItem.java	100.00% <ø> (ø)
...ava/com/faforever/client/game/GamePathHandler.java	35.18% <100.00%> (+0.63%)	⬆️
...va/com/faforever/client/game/VaultPathHandler.java	66.66% <100.00%> (+1.96%)	⬆️
...ver/client/notification/ImmediateNotification.java	55.55% <100.00%> (-17.78%)	⬇️
...er/client/notification/PersistentNotification.java	75.00% <100.00%> (-25.00%)	⬇️
...va/com/faforever/client/notification/Severity.java	100.00% <ø> (ø)
...ver/client/notification/TransientNotification.java	83.33% <100.00%> (+23.33%)	⬆️
... and 39 more

... and 2 files with indirect coverage changes

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