fix(follower): update test that defines a follower relay.

[winder]

Summary

Fix a regression relating to stricter private network config validation. Follower configurations may no longer be marked as a relay.

Test Plan

Existing integration test. I think this change is compatible with the intent of the test that regressed.

[codecov]

Codecov Report

Merging #5162 (67ffdbb) into master (a688c23) will decrease coverage by 0.74%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5162      +/-   ##
==========================================
- Coverage   53.44%   52.71%   -0.74%     
==========================================
  Files         431      431              
  Lines       54364    54364              
==========================================
- Hits        29056    28658     -398     
- Misses      23053    23431     +378     
- Partials     2255     2275      +20     

Impacted Files	Coverage Δ
data/committee/sortition/sortition.go	23.52% <0.00%> (-58.83%)	⬇️
network/messageFilter.go	33.33% <0.00%> (-51.29%)	⬇️
logging/telemetryspec/metric.go	47.87% <0.00%> (-34.05%)	⬇️
crypto/vrf.go	50.00% <0.00%> (-26.93%)	⬇️
rpcs/txSyncer.go	58.49% <0.00%> (-15.10%)	⬇️
data/transactions/signedtxn.go	14.81% <0.00%> (-14.82%)	⬇️
crypto/hashes.go	36.58% <0.00%> (-14.64%)	⬇️
crypto/util.go	41.17% <0.00%> (-11.77%)	⬇️
crypto/falconWrapper.go	65.38% <0.00%> (-11.54%)	⬇️
data/pools/transactionPool.go	38.51% <0.00%> (-11.27%)	⬇️
... and 33 more

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