state-sync: rename current epoch state sync protocol feature

[marcelo-gonzalez]

The old name StateSyncHashUpdate just indicates that something is changing, but doesn't say what. CurrentEpochStateSync is more descriptive.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.64%. Comparing base (38d7e05) to head (f944dba).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12385   +/-   ##
=======================================
  Coverage   71.63%   71.64%           
=======================================
  Files         842      842           
  Lines      170505   170505           
  Branches   170505   170505           
=======================================
+ Hits       122145   122153    +8     
+ Misses      42988    42982    -6     
+ Partials     5372     5370    -2     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (ø)
db-migration	0.16% <0.00%> (ø)
genesis-check	1.26% <0.00%> (ø)
integration-tests	39.20% <100.00%> (+<0.01%)	⬆️
linux	70.68% <100.00%> (-0.01%)	⬇️
linux-nightly	71.22% <100.00%> (+0.01%)	⬆️
macos	50.64% <50.00%> (-0.01%)	⬇️
pytests	1.57% <0.00%> (ø)
sanity-checks	1.38% <0.00%> (ø)
unittests	64.29% <75.00%> (-0.01%)	⬇️
upgradability	0.21% <0.00%> (ø)

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