go: rename compute -> executor

[pro-wh]

it was proposed that we rename the "compute" phase (of the txnscheduler, compute, merge workflow) to "executor"

things that remain as "compute":

• the registry node role
• the registry runtime kind
• the staking threshold kind
• things actually referring to processing inputs to outputs
• one of the drbg contexts

[kostko]

Looks good, so this also requires deployment changes (due to configuration flag renames), don't forget to note them in a changelog fragment once you merge to master.

things that remain as "compute":

• the registry node role

Makes sense.

• the registry runtime kind

Makes sense.

• the staking threshold kind

Makes sense.

• things actually referring to processing inputs to outputs

Makes sense.

• one of the drbg contexts

This would likely require updating all the test seeds, so I'm fine with it staying as-is.

[codecov]

Codecov Report

Merging #2525 into master will increase coverage by 0.25%.
The diff coverage is 79.89%.

@@            Coverage Diff             @@
##           master    #2525      +/-   ##
==========================================
+ Coverage   63.43%   63.68%   +0.25%     
==========================================
  Files         347      347              
  Lines       32324    32324              
==========================================
+ Hits        20505    20587      +82     
+ Misses       9250     9182      -68     
+ Partials     2569     2555      -14

Impacted Files	Coverage Δ
go/registry/api/runtime.go	38.7% <ø> (ø)	⬆️
go/roothash/api/commitment/txnscheduler.go	77.77% <ø> (ø)	⬆️
go/worker/executor/tests/tester.go	85% <ø> (ø)
go/worker/txnscheduler/service.go	29.41% <ø> (ø)	⬆️
go/roothash/api/commitment/merge.go	80.95% <ø> (ø)	⬆️
go/runtime/client/tests/tester.go	100% <ø> (ø)	⬆️
go/storage/api/root_cache.go	70.11% <ø> (ø)	⬆️
go/worker/executor/committee/state.go	74.07% <ø> (ø)
go/worker/merge/committee/state.go	100% <ø> (ø)	⬆️
go/oasis-test-runner/oasis/runtime.go	0% <0%> (ø)	⬆️
... and 56 more

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