[BACKPORT/21.2.x] go/worker/storage: Force checkpoint sync when block info unavailable

[kostko]

Backport of #4080.

[codecov]

Codecov Report

Merging #4084 (b1f36d6) into stable/21.2.x (1d7f325) will decrease coverage by 0.61%.
The diff coverage is 69.46%.

@@                Coverage Diff                @@
##           stable/21.2.x    #4084      +/-   ##
=================================================
- Coverage          66.91%   66.30%   -0.62%     
=================================================
  Files                414      414              
  Lines              42353    42452      +99     
=================================================
- Hits               28342    28149     -193     
- Misses             10000    10307     +307     
+ Partials            4011     3996      -15     

Impacted Files	Coverage Δ
go/consensus/api/api.go	14.28% <ø> (ø)
go/consensus/tendermint/api/state.go	60.27% <0.00%> (+1.94%)	⬆️
go/consensus/tendermint/seed/seed.go	67.33% <0.00%> (-0.46%)	⬇️
go/runtime/registry/registry.go	74.90% <37.50%> (-2.66%)	⬇️
go/worker/storage/committee/node.go	77.76% <59.61%> (-1.57%)	⬇️
go/runtime/nodes/runtime.go	75.53% <60.00%> (-3.22%)	⬇️
go/runtime/nodes/versioned.go	71.68% <70.58%> (-0.70%)	⬇️
go/storage/mkvs/checkpoint/checkpointer.go	79.26% <92.10%> (+1.96%)	⬆️
go/consensus/tendermint/abci/state.go	70.80% <100.00%> (+0.09%)	⬆️
go/consensus/tendermint/full/full.go	63.41% <100.00%> (+0.04%)	⬆️
... and 49 more

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