bug: rename function to reflect actual ability

[akhi3030]

Renames pub fn upgrade_protocol(&mut self, protocol_version: ProtocolVersion) to pub fn upgrade_protocol_to_latest_version(&mut self). The function is unable to upgrade to a specific version but instead always upgrades to the latest version.

Also see #8590.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.30%. Comparing base (f7604cd) to head (1f50112).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11036      +/-   ##
==========================================
+ Coverage   71.12%   71.30%   +0.17%     
==========================================
  Files         758      758              
  Lines      152602   152499     -103     
  Branches   152602   152499     -103     
==========================================
+ Hits       108544   108736     +192     
+ Misses      39608    39329     -279     
+ Partials     4450     4434      -16     

Flag	Coverage Δ
backward-compatibility	0.24% <0.00%> (?)
db-migration	0.24% <0.00%> (?)
genesis-check	1.43% <0.00%> (?)
integration-tests	36.92% <100.00%> (+<0.01%)	⬆️
linux	69.79% <100.00%> (+0.11%)	⬆️
linux-nightly	70.76% <100.00%> (-0.04%)	⬇️
macos	54.40% <0.00%> (-0.03%)	⬇️
pytests	1.66% <0.00%> (?)
sanity-checks	1.45% <0.00%> (?)
unittests	66.96% <0.00%> (+<0.01%)	⬆️
upgradability	0.29% <0.00%> (?)

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[wacban]

LGTM