go/worker/p2p: Include new peers from received node list

[ptrus]

Previously we only removed peers and updated existing peers from the received node list - therefore a node restarting in the middle of an epoch did not actually connect to all of the nodes until the next epoch transition (it only connected to the nodes that did an update mid-epoch - which triggered a WatchNodes event).

Discovered while testing #3322

[codecov]

Codecov Report

Merging #3378 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3378      +/-   ##
==========================================
- Coverage   66.12%   66.11%   -0.01%     
==========================================
  Files         370      370              
  Lines       33228    33228              
==========================================
- Hits        21971    21969       -2     
- Misses       8020     8030      +10     
+ Partials     3237     3229       -8     

Impacted Files	Coverage Δ
go/worker/common/p2p/peermgmt.go	72.64% <ø> (ø)
go/worker/compute/executor/committee/state.go	71.42% <0.00%> (-14.29%)	⬇️
go/consensus/tendermint/api/api.go	74.66% <0.00%> (-10.67%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	74.53% <0.00%> (-3.70%)	⬇️
go/worker/common/committee/node.go	74.86% <0.00%> (-2.80%)	⬇️
go/consensus/tendermint/roothash/roothash.go	70.15% <0.00%> (-2.16%)	⬇️
go/worker/compute/executor/committee/node.go	62.19% <0.00%> (-1.24%)	⬇️
go/runtime/client/watcher.go	66.66% <0.00%> (-1.12%)	⬇️
go/runtime/client/client.go	65.40% <0.00%> (-0.95%)	⬇️
go/storage/api/grpc.go	68.28% <0.00%> (-0.89%)	⬇️
... and 13 more

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