ledger: rollback vetting historical stateproof blocks

[algorandskiy]

Summary

1. Rolled back the Feature: Catchup Eval Stake Exception Round Handling #5795
2. Changed the stakeDiffusionFactor to 1 from 5.

Test Plan

1. Existing unit tests
2. TODO: Manual catchup on the affected range

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (90b10d2) 55.81% compared to head (995d179) 55.79%.

Files	Patch %	Lines
ledger/eval/eval.go	9.52%	18 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5830      +/-   ##
==========================================
- Coverage   55.81%   55.79%   -0.03%     
==========================================
  Files         476      476              
  Lines       67138    67148      +10     
==========================================
- Hits        37476    37468       -8     
- Misses      27141    27157      +16     
- Partials     2521     2523       +2     

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[gmalouf]

Approval - assumes catchup passes and we resolve discussion on whether to in fact keep the new test.