migrate to use bootstrap-defrag-threshold-megabytes flag

[gangli113]

Migrate flag bootstrap-defrag-threshold-megabytes described in: #19141

The experimental flags are marked as deprecated and will be decommissioned in v3.7.

[k8s-ci-robot]

Hi @gangli113. 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.

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.80%. Comparing base (2ee7e34) to head (267020e).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
server/etcdserver/bootstrap.go	0.00%	1 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/config.go	79.59% <100.00%> (+0.03%)	⬆️
server/embed/etcd.go	76.49% <100.00%> (ø)
server/etcdmain/config.go	72.83% <100.00%> (+0.33%)	⬆️
server/etcdserver/bootstrap.go	63.59% <0.00%> (ø)

... and 22 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19267      +/-   ##
==========================================
+ Coverage   68.77%   68.80%   +0.02%     
==========================================
  Files         420      420              
  Lines       35677    35680       +3     
==========================================
+ Hits        24538    24550      +12     
+ Misses       9714     9701      -13     
- Partials     1425     1429       +4     

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[siyuanfoundation]

/ok-to-test

[gangli113]

/cc @siyuanfoundation @serathius @ahrtr

[ahrtr]

LGTM

[ahrtr]

/test pull-etcd-e2e-amd64

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, gangli113, siyuanfoundation

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