etcdserver: get peer's hash using the same revision as the value used by leader

[ahrtr]

Currently the leader uses its latest revision to get peers' hashes, it isn't correct, instead it should use the same revision which it uses to calculate the hash locally. Although it has the same results, but it isn't semantically correct.

cc @serathius @spzala

[codecov-commenter]

Codecov Report

Merging #14536 (2520c10) into main (d379e62) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #14536      +/-   ##
==========================================
- Coverage   75.35%   75.24%   -0.11%     
==========================================
  Files         457      457              
  Lines       37181    37176       -5     
==========================================
- Hits        28017    27974      -43     
- Misses       7405     7435      +30     
- Partials     1759     1767       +8     

Flag	Coverage Δ
all	75.24% <100.00%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/etcdserver/corrupt.go	89.26% <100.00%> (-0.18%)	⬇️
client/v3/namespace/watch.go	87.87% <0.00%> (-6.07%)	⬇️
server/etcdserver/api/v3rpc/member.go	93.54% <0.00%> (-3.23%)	⬇️
server/proxy/grpcproxy/watch.go	93.64% <0.00%> (-2.90%)	⬇️
client/v3/leasing/kv.go	89.03% <0.00%> (-1.33%)	⬇️
client/v3/maintenance.go	59.74% <0.00%> (-1.26%)	⬇️
client/v3/op.go	74.71% <0.00%> (-1.15%)	⬇️
server/etcdserver/api/v3rpc/interceptor.go	76.56% <0.00%> (-1.05%)	⬇️
client/v3/client.go	80.12% <0.00%> (-0.95%)	⬇️
client/v3/retry_interceptor.go	66.36% <0.00%> (-0.91%)	⬇️
... and 6 more

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[ahrtr]

The PR should be ready to go. Please take a look, thx. cc @spzala @serathius