go/runtime/transaction: Ensure consistent batch order indices

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #3248 into master will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3248      +/-   ##
==========================================
+ Coverage   67.47%   67.61%   +0.14%     
==========================================
  Files         370      370              
  Lines       36327    36330       +3     
==========================================
+ Hits        24513    24566      +53     
+ Misses       8638     8598      -40     
+ Partials     3176     3166      -10     

Impacted Files	Coverage Δ
go/runtime/transaction/transaction.go	78.40% <100.00%> (+2.68%)	⬆️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	84.00% <0.00%> (-8.00%)	⬇️
go/storage/api/root_cache.go	74.60% <0.00%> (-6.35%)	⬇️
go/keymanager/client/client.go	82.64% <0.00%> (-5.79%)	⬇️
...n/crypto/signature/signers/memory/memory_signer.go	71.42% <0.00%> (-4.77%)	⬇️
go/worker/common/p2p/dispatch.go	76.52% <0.00%> (-4.35%)	⬇️
go/storage/mkvs/tree.go	89.28% <0.00%> (-3.58%)	⬇️
go/storage/mkvs/insert.go	87.75% <0.00%> (-2.73%)	⬇️
go/staking/api/grpc.go	51.93% <0.00%> (-2.33%)	⬇️
... and 28 more

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