Rename snapshot_data to snapshot_obj

[yuwmao]

Update snapshot function name based on the homestore API change.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.15%. Comparing base (1746bcc) to head (bb0b2b4).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...ib/homestore_backend/replication_state_machine.cpp	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   63.15%   65.15%   +1.99%     
==========================================
  Files          32       32              
  Lines        1900     1980      +80     
  Branches      204      213       +9     
==========================================
+ Hits         1200     1290      +90     
+ Misses        600      582      -18     
- Partials      100      108       +8     

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