go/runtime/history: Limit batch size when pruning rounds

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #4345 (c01cd26) into master (eb49625) will decrease coverage by 0.77%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4345      +/-   ##
==========================================
- Coverage   69.31%   68.53%   -0.78%     
==========================================
  Files         411      411              
  Lines       47417    47417              
==========================================
- Hits        32866    32499     -367     
- Misses      10543    10868     +325     
- Partials     4008     4050      +42     

Impacted Files	Coverage Δ
go/runtime/history/prune.go	82.75% <100.00%> (ø)
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/storage/api/context.go	87.87% <0.00%> (-12.13%)	⬇️
go/runtime/host/sandbox/sandbox.go	67.03% <0.00%> (-11.36%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	84.00% <0.00%> (-8.00%)	⬇️
go/consensus/tendermint/abci/state/state.go	61.53% <0.00%> (-7.70%)	⬇️
go/consensus/tendermint/apps/staking/auth.go	70.37% <0.00%> (-7.41%)	⬇️
go/runtime/host/protocol/connection.go	65.25% <0.00%> (-7.34%)	⬇️
... and 44 more

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