go/runtime: Remove obsolete transaction types

[kostko]

See #3572
Leftover from #4198.

[codecov]

Codecov Report

Merging #4228 (ae2b720) into master (809520c) will decrease coverage by 0.61%.
The diff coverage is n/a.

❗ Current head ae2b720 differs from pull request most recent head 64b36a5. Consider uploading reports for the commit 64b36a5 to get more accurate results

@@            Coverage Diff             @@
##           master    #4228      +/-   ##
==========================================
- Coverage   69.16%   68.55%   -0.62%     
==========================================
  Files         408      408              
  Lines       46936    46936              
==========================================
- Hits        32465    32177     -288     
- Misses      10483    10770     +287     
- Partials     3988     3989       +1     

Impacted Files	Coverage Δ
...nsensus/tendermint/apps/keymanager/transactions.go	0.00% <0.00%> (-52.95%)	⬇️
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	71.79% <0.00%> (-9.90%)	⬇️
...consensus/tendermint/apps/keymanager/keymanager.go	59.34% <0.00%> (-7.70%)	⬇️
go/oasis-node/cmd/ias/auth.go	68.96% <0.00%> (-6.90%)	⬇️
go/common/sgx/aesm/aesm.go	63.63% <0.00%> (-6.37%)	⬇️
...nsensus/tendermint/apps/beacon/state/state_pvss.go	75.00% <0.00%> (-6.25%)	⬇️
go/keymanager/client/client.go	72.72% <0.00%> (-5.79%)	⬇️
go/consensus/tendermint/apps/beacon/genesis.go	65.71% <0.00%> (-5.72%)	⬇️
... and 33 more

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