fix: Fix data race on loadSealedSegmentFields opts

[congqixia]

See also #31229

[sre-ci-robot]

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[mergify]

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

[congqixia]

/run-cpu-e2e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.08%. Comparing base (06b191b) to head (04d9af8).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #31230      +/-   ##
==========================================
- Coverage   81.13%   81.08%   -0.05%     
==========================================
  Files         975      975              
  Lines      142206   142207       +1     
==========================================
- Hits       115373   115310      -63     
- Misses      22987    23043      +56     
- Partials     3846     3854       +8     

Files	Coverage Δ
internal/querynodev2/segments/segment_loader.go	71.28% <100.00%> (+0.02%)	⬆️

... and 26 files with indirect coverage changes

[sunby]

/lgtm