Migrate experimental distributed tracing flags to non-experimental flags

[ahrtr]

Fix #19050

Part of #18023

[codecov]

Codecov Report

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

Project coverage is 68.94%. Comparing base (1ea4f43) to head (a9b8cba).
Report is 2 commits behind head on main.

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 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19385      +/-   ##
==========================================
+ Coverage   68.91%   68.94%   +0.02%     
==========================================
  Files         420      420              
  Lines       35739    35756      +17     
==========================================
+ Hits        24631    24652      +21     
+ Misses       9684     9680       -4     
  Partials     1424     1424              

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[ahrtr]

cc @fuweid @ivanvc @siyuanfoundation @serathius

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid

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[ahrtr]

/cherry-pick release-3.6

[k8s-infra-cherrypick-robot]

@ahrtr: new pull request created: #19387

In response to this:

/cherry-pick release-3.6

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