go/oasis-node/cmd: unsafe-reset preserve mkvs by default

[pro-wh]

cross reference: https://app.clickup.com/t/294pfzp

Preserving the mkvs database is becoming the more common workflow, so we're changing the default to be true.

Use --preserve.mkvs_database=false to wipe the mkvs database as the previous default did.

[kostko]

Also backport to 22.0.x and 21.3.x.

[pro-wh]

oop gotta update oasis-test-runner

[codecov]

Codecov Report

Merging #4588 (423b989) into master (def2f97) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4588      +/-   ##
==========================================
+ Coverage   66.71%   66.86%   +0.14%     
==========================================
  Files         427      427              
  Lines       48173    48173              
==========================================
+ Hits        32141    32213      +72     
+ Misses      12079    12023      -56     
+ Partials     3953     3937      -16     

Impacted Files	Coverage Δ
go/oasis-node/cmd/node/unsafe_reset.go	63.63% <100.00%> (ø)
go/storage/mkvs/lookup.go	75.00% <0.00%> (-4.17%)	⬇️
...nt/apps/supplementarysanity/supplementarysanity.go	77.61% <0.00%> (-2.99%)	⬇️
...nsensus/tendermint/apps/beacon/backend_insecure.go	58.24% <0.00%> (-2.20%)	⬇️
go/worker/compute/executor/committee/node.go	69.25% <0.00%> (-1.32%)	⬇️
go/worker/client/committee/node.go	73.54% <0.00%> (-1.30%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	65.27% <0.00%> (-1.26%)	⬇️
go/runtime/txpool/txpool.go	75.96% <0.00%> (-1.04%)	⬇️
...nsus/tendermint/apps/supplementarysanity/checks.go	47.08% <0.00%> (-0.98%)	⬇️
go/runtime/host/protocol/connection.go	69.17% <0.00%> (-0.76%)	⬇️
... and 24 more

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[pro-wh]

tsk now this PR is stuck open even though it's merged

[pro-wh]

oh good, commenting fixed it