Add tests for hardcoded flags in TestEtcdServerProcessConfig

[serathius]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.
cc @ahrtr @siyuanfoundation @fuweid

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.80%. Comparing base (7c56ef2) to head (ce54561).

Additional details and impacted files

see 27 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19245      +/-   ##
==========================================
+ Coverage   68.77%   68.80%   +0.02%     
==========================================
  Files         420      420              
  Lines       35649    35649              
==========================================
+ Hits        24518    24528      +10     
+ Misses       9705     9697       -8     
+ Partials     1426     1424       -2     

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[serathius]

cc @AwesomePatrol

[serathius]

/retest

[fuweid]

LGTM

(failure is known issue)

[fuweid]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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