go/e2e/governance-upgrade: wait for compute nodes to be ready

[ptrus]

This should help with the governance-upgrade test flakiness where the runtime client request would be sent before the compute nodes were ready (related to: #3599 as compute nodes take a bit more time to get initialized after a restart now).

[codecov]

Codecov Report

Merging #3618 (b868ace) into master (37c096d) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3618      +/-   ##
==========================================
+ Coverage   67.35%   67.37%   +0.01%     
==========================================
  Files         390      390              
  Lines       36540    36540              
==========================================
+ Hits        24613    24618       +5     
+ Misses       8482     8474       -8     
- Partials     3445     3448       +3     

Impacted Files	Coverage Δ
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
...nsensus/tendermint/apps/staking/signing_rewards.go	20.00% <0.00%> (-5.72%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	56.58% <0.00%> (-5.43%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	73.92% <0.00%> (-2.73%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	53.06% <0.00%> (-2.73%)	⬇️
go/runtime/tagindexer/tagindexer.go	66.27% <0.00%> (-2.33%)	⬇️
go/consensus/tendermint/apps/registry/genesis.go	38.67% <0.00%> (-1.89%)	⬇️
go/roothash/api/commitment/pool.go	71.02% <0.00%> (-1.87%)	⬇️
go/worker/common/committee/runtime_host.go	64.28% <0.00%> (-1.79%)	⬇️
go/consensus/tendermint/apps/staking/fees.go	47.82% <0.00%> (-1.45%)	⬇️
... and 27 more

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