Minor refactor on RaftCluster.Recover()

[ahrtr]

Extracted from #19168

cc @fuweid @serathius @ivanvc @jmhbnz

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (ce4b4e5) to head (8d0f165).
Report is 6 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdserver/api/membership/cluster.go	88.57% <100.00%> (+0.04%)	⬆️

... and 21 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #19200   +/-   ##
=======================================
  Coverage   68.82%   68.82%           
=======================================
  Files         420      420           
  Lines       35627    35629    +2     
=======================================
+ Hits        24519    24523    +4     
- Misses       9688     9694    +6     
+ Partials     1420     1412    -8     

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[ahrtr]

/test pull-etcd-integration-4-cpu-amd64

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