Remove staking-related roothash messages

[kostko]

Fixes #2377

[codecov]

Codecov Report

Merging #2493 into master will decrease coverage by 0.18%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2493      +/-   ##
==========================================
- Coverage   67.45%   67.27%   -0.19%     
==========================================
  Files         321      321              
  Lines       29768    29503     -265     
==========================================
- Hits        20080    19847     -233     
+ Misses       7242     7224      -18     
+ Partials     2446     2432      -14

Impacted Files	Coverage Δ
go/roothash/api/block/header.go	72.97% <ø> (ø)	⬆️
go/staking/api/api.go	50.89% <ø> (ø)	⬆️
go/common/version/version.go	84% <ø> (ø)	⬆️
...o/consensus/tendermint/apps/staking/state/state.go	68.39% <ø> (-0.14%)	⬇️
go/staking/tests/debug/debug_stake.go	60% <ø> (ø)	⬆️
go/roothash/tests/tester.go	96.49% <ø> (-1.1%)	⬇️
go/roothash/api/commitment/compute.go	77.41% <ø> (ø)	⬆️
go/consensus/tendermint/apps/roothash/roothash.go	68.68% <0%> (-2.57%)	⬇️
go/roothash/api/commitment/pool.go	70.5% <0%> (-0.42%)	⬇️
go/roothash/api/api.go	61.11% <0%> (ø)	⬆️
... and 15 more

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