testing: remove account balance checks

[AlgoStephenAkiki]

Summary

Adds additional resilience to participation expiration test TestParticipationAccountsExpirationFuture.

Test Plan

This is a test.

[codecov-commenter]

Codecov Report

Merging #3054 (782ba9b) into master (3572e1f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3054   +/-   ##
=======================================
  Coverage   43.65%   43.66%           
=======================================
  Files         391      391           
  Lines       86792    86792           
=======================================
+ Hits        37893    37901    +8     
+ Misses      42872    42866    -6     
+ Partials     6027     6025    -2     

Impacted Files	Coverage Δ
agreement/cryptoVerifier.go	75.73% <0.00%> (-2.21%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
network/wsNetwork.go	62.95% <0.00%> (ø)
ledger/acctupdates.go	66.53% <0.00%> (+0.09%)	⬆️
network/wsPeer.go	74.09% <0.00%> (+0.51%)	⬆️
data/transactions/verify/txn.go	44.29% <0.00%> (+0.87%)	⬆️
data/abi/abi_type.go	91.81% <0.00%> (+0.90%)	⬆️
txnsync/encodedgroupsmarshalers.go	100.00% <0.00%> (+1.12%)	⬆️

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