go/executor/node: check if we are in correct state before publishing a message

[ptrus]

Currently (since #3320) this check is made after a node publishes a message, instead this check should be made before node publishes a message to prevent proposing another batch after node starts processing a batch.
Note that p2p.Publish is async so this shouldn't increase the time the CrossNode.Lock is held by much.

[codecov]

Codecov Report

Merging #3342 into master will increase coverage by 0.08%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master    #3342      +/-   ##
==========================================
+ Coverage   65.34%   65.43%   +0.08%     
==========================================
  Files         371      371              
  Lines       33151    33151              
==========================================
+ Hits        21664    21693      +29     
+ Misses       8281     8253      -28     
+ Partials     3206     3205       -1     

Impacted Files	Coverage Δ
go/worker/compute/executor/committee/node.go	65.51% <53.84%> (+2.95%)	⬆️
go/common/grpc/errors.go	72.34% <0.00%> (-12.77%)	⬇️
go/consensus/tendermint/api/errors.go	90.00% <0.00%> (-10.00%)	⬇️
go/common/grpc/policy/policy.go	62.12% <0.00%> (-7.58%)	⬇️
go/keymanager/client/client.go	81.41% <0.00%> (-6.20%)	⬇️
...nsensus/tendermint/apps/staking/signing_rewards.go	20.00% <0.00%> (-5.72%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	74.90% <0.00%> (-5.17%)	⬇️
go/worker/common/committee/runtime_host.go	62.88% <0.00%> (-5.16%)	⬇️
go/consensus/tendermint/full/services.go	81.35% <0.00%> (-4.24%)	⬇️
go/consensus/tendermint/apps/staking/state/gas.go	81.13% <0.00%> (-3.78%)	⬇️
... and 27 more

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