go/worker/client: Better handle latest round queries with verification

[kostko]

When a query is requesting to be executed against the latest round and the runtime reports a consensus verifier error, use an earlier round instead as the latest round may not yet be verifiable by the light client as it needs to wait for the validator signatures.

[codecov]

Codecov Report

Merging #5123 (9b520ae) into master (9dcdfef) will increase coverage by 0.04%.
The diff coverage is 33.89%.

@@            Coverage Diff             @@
##           master    #5123      +/-   ##
==========================================
+ Coverage   66.93%   66.97%   +0.04%     
==========================================
  Files         496      496              
  Lines       53253    53271      +18     
==========================================
+ Hits        35643    35679      +36     
+ Misses      13277    13258      -19     
- Partials     4333     4334       +1     

Impacted Files	Coverage Δ
go/consensus/tendermint/apps/beacon/backend_vrf.go	58.89% <ø> (ø)
.../consensus/tendermint/apps/registry/state/state.go	61.28% <0.00%> (ø)
...consensus/tendermint/apps/registry/transactions.go	57.14% <0.00%> (-0.09%)	⬇️
go/registry/api/api.go	55.00% <15.38%> (+1.21%)	⬆️
go/worker/client/committee/node.go	68.39% <31.03%> (-5.16%)	⬇️
go/common/node/node.go	71.07% <100.00%> (ø)
go/consensus/tendermint/tests/genesis/genesis.go	91.78% <100.00%> (ø)
go/oasis-node/cmd/registry/node/node.go	43.22% <100.00%> (ø)
go/registry/tests/tester.go	92.48% <100.00%> (ø)
go/worker/registration/worker.go	64.13% <100.00%> (+0.16%)	⬆️
... and 45 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.