enhance[2.5]: move GetVector_EmptySparseVector ut to growing test

[zhengbuqian]

issue: #35853
pr: #39234

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[mergify]

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[mergify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.02%. Comparing base (5b0bb4c) to head (7597e0f).
Report is 1 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39286      +/-   ##
==========================================
- Coverage   81.04%   81.02%   -0.02%     
==========================================
  Files        1400     1400              
  Lines      196950   196950              
==========================================
- Hits       159614   159584      -30     
- Misses      31710    31739      +29     
- Partials     5626     5627       +1     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.58% <ø> (ø)
Go	82.97% <ø> (-0.02%)	⬇️

see 23 files with indirect coverage changes