go/e2e/txsource: add txsource SGX scenario using fewer nodes

[ptrus]

No description provided.

[codecov]

Codecov Report

Merging #3595 (c05d7be) into master (db2516f) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3595      +/-   ##
==========================================
+ Coverage   66.60%   66.64%   +0.04%     
==========================================
  Files         377      377              
  Lines       34568    34568              
==========================================
+ Hits        23024    23039      +15     
+ Misses       8229     8205      -24     
- Partials     3315     3324       +9     

Impacted Files	Coverage Δ
go/worker/keymanager/watcher.go	60.00% <0.00%> (-11.67%)	⬇️
go/storage/mkvs/tree.go	86.95% <0.00%> (-4.35%)	⬇️
go/storage/api/root_cache.go	78.33% <0.00%> (-3.34%)	⬇️
.../consensus/tendermint/apps/roothash/state/state.go	74.28% <0.00%> (-2.86%)	⬇️
go/storage/mkvs/insert.go	87.67% <0.00%> (-2.74%)	⬇️
go/storage/database/database.go	68.23% <0.00%> (-2.36%)	⬇️
go/storage/mkvs/lookup.go	72.04% <0.00%> (-2.16%)	⬇️
go/storage/client/client.go	72.46% <0.00%> (-1.94%)	⬇️
go/runtime/nodes/versioned.go	74.28% <0.00%> (-1.91%)	⬇️
go/runtime/client/watcher.go	62.96% <0.00%> (-1.49%)	⬇️
... and 13 more

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