tests: Migrate member tests to common framework

[clement2026]

Context #13637

[serathius]

This check is not needed as you check expectNum != gotNum above. expectNum is guaranteed to be at least 1.

[serathius]

Please fix DCO by running git commit --amend -s

[clement2026]

Please fix DCO by running git commit --amend -s

Thanks!

[codecov-commenter]

Codecov Report

Merging #14271 (50ba143) into main (4977877) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #14271      +/-   ##
==========================================
- Coverage   75.40%   75.23%   -0.17%     
==========================================
  Files         456      456              
  Lines       36919    36919              
==========================================
- Hits        27838    27776      -62     
- Misses       7345     7397      +52     
- Partials     1736     1746      +10     

Flag	Coverage Δ
all	75.23% <ø> (-0.17%)	⬇️

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

Impacted Files	Coverage Δ
client/pkg/v3/tlsutil/tlsutil.go	83.33% <0.00%> (-8.34%)	⬇️
client/v3/namespace/watch.go	87.87% <0.00%> (-6.07%)	⬇️
server/etcdserver/api/v3rpc/watch.go	83.55% <0.00%> (-5.04%)	⬇️
client/v3/leasing/cache.go	87.77% <0.00%> (-3.89%)	⬇️
server/etcdserver/cluster_util.go	70.35% <0.00%> (-3.17%)	⬇️
client/v3/concurrency/election.go	79.68% <0.00%> (-2.35%)	⬇️
server/etcdserver/api/rafthttp/msgappv2_codec.go	69.56% <0.00%> (-1.74%)	⬇️
server/storage/mvcc/watchable_store.go	88.40% <0.00%> (-1.45%)	⬇️
server/etcdserver/api/v3rpc/maintenance.go	75.34% <0.00%> (-1.37%)	⬇️
pkg/schedule/schedule.go	80.45% <0.00%> (-1.15%)	⬇️
... and 11 more

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