Remove testnet3 definition

[soffokl]

No description provided.

[codecov-commenter]

Codecov Report

Merging #4916 (8e1e242) into master (60336f9) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4916      +/-   ##
==========================================
- Coverage   39.20%   39.17%   -0.04%     
==========================================
  Files         358      358              
  Lines       19205    19205              
==========================================
- Hits         7529     7523       -6     
- Misses      10956    10961       +5     
- Partials      720      721       +1     

Impacted Files	Coverage Δ
mobile/mysterium/entrypoint.go	0.00% <0.00%> (ø)
nat/traversal/pinger.go	78.29% <0.00%> (-1.56%)	⬇️
requests/dialer_swarm.go	75.93% <0.00%> (-1.51%)	⬇️
tequilapi/endpoints/sse_handler.go	71.94% <0.00%> (-1.44%)	⬇️
p2p/channel.go	66.06% <0.00%> (-0.73%)	⬇️
core/policy/oracle.go	91.89% <0.00%> (+5.40%)	⬆️

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