Fix data races

[Zensey]

Resolves #5999

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.25000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 37.96%. Comparing base (4a517cd) to head (bb20c95).
Report is 28 commits behind head on master.

Files	Patch %	Lines
services/wireguard/service/service.go	40.00%	2 Missing and 1 partial ⚠️
core/service/pool.go	81.81%	1 Missing and 1 partial ⚠️
session/pingpong/hermes_channel.go	71.42%	1 Missing and 1 partial ⚠️
core/state/state.go	80.00%	1 Missing ⚠️
session/pingpong/hermes_channel_repository.go	92.85%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6003      +/-   ##
==========================================
+ Coverage   37.90%   37.96%   +0.05%     
==========================================
  Files         371      371              
  Lines       20665    20699      +34     
==========================================
+ Hits         7833     7858      +25     
- Misses      12054    12057       +3     
- Partials      778      784       +6     

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[soffokl]

@Zensey could you please add a test that proves the data race exists before the PR?
And after the PR fix, this race test starts to work and will protect us from appearing again in the future?

[Zensey]

@Zensey could you please add a test that proves the data race exists before the PR? And after the PR fix, this race test starts to work and will protect us from appearing again in the future?

@soffokl
done