[cip-56] Remove freezable check on epoch rewards

[gastonponti]

Description

Implementation of the CIP-56 (https://github.com/celo-org/celo-proposals/blob/master/CIPs/cip-0056.md)

Tested

Run tests

Backwards compatibility

Part of the Gingerbread Hard Fork

[github-actions]

Coverage from tests in ./e2e_test/... for ./consensus/istanbul/... at commit f1ecb60

coverage: 49.7% of statements across all listed packages

coverage:  63.2% of statements in consensus/istanbul
coverage:  43.1% of statements in consensus/istanbul/announce
coverage:  55.7% of statements in consensus/istanbul/backend
coverage:   0.0% of statements in consensus/istanbul/backend/backendtest
coverage:  24.3% of statements in consensus/istanbul/backend/internal/replica
coverage:  60.9% of statements in consensus/istanbul/core
coverage:  50.0% of statements in consensus/istanbul/db
coverage:   0.0% of statements in consensus/istanbul/proxy
coverage:  64.4% of statements in consensus/istanbul/uptime
coverage:  51.8% of statements in consensus/istanbul/validator
coverage:  79.2% of statements in consensus/istanbul/validator/random

[github-actions]

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.10% 🎉

Comparison is base (4a1e3fc) 55.16% compared to head (04d481e) 55.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2164      +/-   ##
==========================================
+ Coverage   55.16%   55.27%   +0.10%     
==========================================
  Files         676      676              
  Lines      113990   113991       +1     
==========================================
+ Hits        62880    63005     +125     
+ Misses      47229    47124     -105     
+ Partials     3881     3862      -19     

Files Changed	Coverage Δ
consensus/istanbul/backend/pos.go	5.74% <0.00%> (-1.77%)	⬇️

... and 31 files with indirect coverage changes

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