Deflake TestEtcdGrpcResolverRoundRobin: sleep 1s to allow all grpc sub channels to be ready

[ahrtr]

Deflake TestEtcdGrpcResolverRoundRobin.

Refer to https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/etcd-io_etcd/22171/pull-etcd-coverage-report/2080221255151128576

cc @fuweid @ivanvc @serathius

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.72%. Comparing base (c13fd85) to head (7bcf013).

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #22173      +/-   ##
==========================================
+ Coverage   69.65%   69.72%   +0.07%     
==========================================
  Files         449      449              
  Lines       38188    38188              
==========================================
+ Hits        26600    26628      +28     
+ Misses      10152    10134      -18     
+ Partials     1436     1426      -10     

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[ahrtr]

/test pull-etcd-integration-4-cpu-arm64