Add dummy go files for test only package, to mitigate golang/go#27333

[elichai]

Because of golang/go#27333 our coverage file is currently empty and failing, to mitigate this we just need a non-test go file in testing only packages

[codecov]

Codecov Report

Merging #1480 (7b0f8be) into v0.9.0-dev (97be133) will increase coverage by 61.58%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           v0.9.0-dev    #1480       +/-   ##
===============================================
+ Coverage            0   61.58%   +61.58%     
===============================================
  Files               0      508      +508     
  Lines               0    18928    +18928     
===============================================
+ Hits                0    11656    +11656     
- Misses              0     5621     +5621     
- Partials            0     1651     +1651     

Impacted Files	Coverage Δ
domain/consensus/utils/txscript/error.go	88.88% <0.00%> (ø)
app/appmessage/rpc_notify_utxos_changed.go	85.71% <0.00%> (ø)
domain/consensus/utils/subnetworks/subnetworks.go	100.00% <0.00%> (ø)
app/app.go	0.00% <0.00%> (ø)
...pp/appmessage/p2p_msgibdblocklocatorhighesthash.go	100.00% <0.00%> (ø)
app/rpc/rpchandlers/unban.go	0.00% <0.00%> (ø)
infrastructure/logger/logs.go	57.33% <0.00%> (ø)
domain/miningmanager/mempool/error.go	10.52% <0.00%> (ø)
infrastructure/network/dnsseed/seed.go	0.00% <0.00%> (ø)
app/rpc/rpccontext/utxos_by_addresses.go	100.00% <0.00%> (ø)
... and 498 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 97be133...f50def2. Read the comment docs.