Storage checkpoint restore related fixes

[kostko]

Fixes #3329
Fixes #3330

• go/worker/storage: Abort multipart insert after failed finalize

  Make sure to abort the multipart insert after a failed finalize operation as
  otherwise all normal batch operations will continue to fail.

• go/storage/mkvs: Fix Finalize after checkpoint restore

[codecov]

Codecov Report

Merging #3331 into master will decrease coverage by 0.09%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #3331      +/-   ##
==========================================
- Coverage   65.18%   65.08%   -0.10%     
==========================================
  Files         371      371              
  Lines       33177    33181       +4     
==========================================
- Hits        21626    21597      -29     
- Misses       8350     8375      +25     
- Partials     3201     3209       +8     

Impacted Files	Coverage Δ
go/worker/storage/committee/checkpoint_sync.go	78.59% <0.00%> (-0.81%)	⬇️
go/storage/mkvs/db/badger/badger.go	68.27% <100.00%> (ø)
go/storage/mkvs/lookup.go	72.63% <0.00%> (-6.32%)	⬇️
.../consensus/tendermint/apps/epochtime_mock/state.go	70.00% <0.00%> (-5.00%)	⬇️
go/storage/metrics.go	75.38% <0.00%> (-4.62%)	⬇️
go/consensus/tendermint/full/services.go	81.35% <0.00%> (-4.24%)	⬇️
go/worker/keymanager/handler.go	57.14% <0.00%> (-4.09%)	⬇️
.../consensus/tendermint/apps/roothash/state/state.go	74.28% <0.00%> (-2.86%)	⬇️
go/consensus/tendermint/roothash/roothash.go	69.53% <0.00%> (-2.47%)	⬇️
go/storage/mkvs/insert.go	90.41% <0.00%> (-1.37%)	⬇️
... and 19 more

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