Still return continuous WAL entries when running into ErrSliceOutOfRange

[ahrtr]

Please read #19038 (comment) and #19038 (comment)

cc @serathius @siyuanfoundation

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

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[ahrtr]

Confirmed that this PR can fix the error in #19038 (comment). @siyuanfoundation please let me know if you can still reproduce it in your environment.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.71%. Comparing base (40b856e) to head (152de1f).

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/wal/wal.go	57.88% <100.00%> (ø)

... and 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19095      +/-   ##
==========================================
- Coverage   68.77%   68.71%   -0.06%     
==========================================
  Files         420      420              
  Lines       35642    35642              
==========================================
- Hits        24513    24492      -21     
- Misses       9703     9719      +16     
- Partials     1426     1431       +5     

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