Clear stale consumer sessions on new connect

[soffokl]

Closes: #2176

[codecov-commenter]

Codecov Report

Merging #2285 into master will increase coverage by 0.02%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #2285      +/-   ##
==========================================
+ Coverage   47.89%   47.91%   +0.02%     
==========================================
  Files         275      275              
  Lines       12797    12810      +13     
==========================================
+ Hits         6129     6138       +9     
- Misses       6079     6083       +4     
  Partials      589      589              

Impacted Files	Coverage Δ
session/event_based_storage.go	75.00% <0.00%> (-3.27%)	⬇️
session/manager.go	60.86% <93.33%> (+7.02%)	⬆️
session/storage_memory.go	89.65% <100.00%> (+1.72%)	⬆️
tequilapi/endpoints/sse_handler.go	72.17% <0.00%> (-2.61%)	⬇️
p2p/channel.go	74.32% <0.00%> (-2.30%)	⬇️
core/discovery/discovery.go	64.75% <0.00%> (-0.82%)	⬇️
nat/traversal/pinger.go	74.27% <0.00%> (+1.94%)	⬆️

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[vkuznecovas]

could we have a test please?