[release-3.6] Migrate experimental distributed tracing flags to non-experimental flags

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #19385

/assign ahrtr

[k8s-ci-robot]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ahrtr]

/ok-to-test

[codecov]

Codecov Report

Attention: Patch coverage is 97.91667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.88%. Comparing base (092fff4) to head (164f8cf).
Report is 2 commits behind head on release-3.6.

Files with missing lines	Patch %	Lines
server/embed/config.go	93.75%	0 Missing and 1 partial ⚠️
server/embed/config_tracing.go	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/config/config.go	80.23% <ø> (ø)
server/embed/etcd.go	76.36% <100.00%> (ø)
server/etcdmain/config.go	75.82% <100.00%> (+1.40%)	⬆️
server/etcdserver/api/v3rpc/grpc.go	95.12% <100.00%> (ø)
server/embed/config.go	79.94% <93.75%> (+0.21%)	⬆️
server/embed/config_tracing.go	82.60% <87.50%> (ø)

... and 27 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #19387      +/-   ##
===============================================
+ Coverage        68.87%   68.88%   +0.01%     
===============================================
  Files              420      420              
  Lines            35739    35756      +17     
===============================================
+ Hits             24615    24632      +17     
- Misses            9694     9695       +1     
+ Partials          1430     1429       -1     

---

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[ahrtr]

cc @fuweid @siyuanfoundation @serathius

[ahrtr]

/test pull-etcd-integration-1-cpu-amd64

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid, k8s-infra-cherrypick-robot

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