stateproofs: reorganize the full pool tests

[algonautshant]

Divide the test into two tests, one without load, and one with load.
Skip the SP in block check for the latter.

[codecov]

Codecov Report

Merging #4370 (1d1ad71) into feature/stateproofs (d96506d) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@                   Coverage Diff                   @@
##           feature/stateproofs    #4370      +/-   ##
=======================================================
- Coverage                55.68%   55.62%   -0.07%     
=======================================================
  Files                      402      402              
  Lines                    50773    50773              
=======================================================
- Hits                     28275    28242      -33     
- Misses                   20116    20145      +29     
- Partials                  2382     2386       +4     

Impacted Files	Coverage Δ
ledger/tracker.go	73.50% <0.00%> (-3.85%)	⬇️
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
catchup/service.go	69.38% <0.00%> (-1.49%)	⬇️
util/db/dbutil.go	49.09% <0.00%> (-1.22%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/transactions/verify/txn.go	44.00% <0.00%> (-0.89%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
ledger/acctupdates.go	69.92% <0.00%> (-0.61%)	⬇️
... and 4 more

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