test: fix TestAccountsCanSendMoney

[ghost]

Summary

The TestAccountsCanSendMoney test flakes and sometimes returns that an account has a different balance than expected. This happens because we don't wait for all txns to confirm, only a set of them. Fix it such that we wait for all txns to confirm.

Test Plan

This is a test.

[codecov]

Codecov Report

Merging #4354 (f7906df) into master (7a56ea7) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4354      +/-   ##
==========================================
- Coverage   55.23%   55.21%   -0.02%     
==========================================
  Files         395      395              
  Lines       50352    50352              
==========================================
- Hits        27811    27804       -7     
- Misses      20149    20155       +6     
- Partials     2392     2393       +1     

Impacted Files	Coverage Δ
ledger/tracker.go	71.79% <0.00%> (-5.56%)	⬇️
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
catchup/service.go	68.88% <0.00%> (-1.24%)	⬇️
data/abi/abi_type.go	87.67% <0.00%> (-0.95%)	⬇️
data/transactions/verify/txn.go	44.00% <0.00%> (-0.89%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
ledger/acctupdates.go	70.52% <0.00%> (+0.60%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️
network/wsPeer.go	67.67% <0.00%> (+2.19%)	⬆️

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more