fix: may exceed max tnx in etcd operations

[jaime0815]

issue: #36772

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[mergify]

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[mergify]

@jaime0815 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.43%. Comparing base (0751c50) to head (6554049).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #36775      +/-   ##
==========================================
- Coverage   84.59%   82.43%   -2.17%     
==========================================
  Files        1024     1305     +281     
  Lines      130316   153724   +23408     
==========================================
+ Hits       110238   126718   +16480     
- Misses      14987    21907    +6920     
- Partials     5091     5099       +8     

Files with missing lines	Coverage Δ
internal/metastore/kv/rootcoord/suffix_snapshot.go	81.63% <100.00%> (ø)

... and 306 files with indirect coverage changes