Respect Spree.user_class' table name in metadata migration

[tvdeyen]

Summary

A Spree.user_class might have a different table_name than spree_users. In order to support this we need to ask the class for it's table_name.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.81%. Comparing base (2678765) to head (1bcdfe4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6157      +/-   ##
==========================================
+ Coverage   86.64%   88.81%   +2.16%     
==========================================
  Files         514      835     +321     
  Lines       11891    18152    +6261     
==========================================
+ Hits        10303    16121    +5818     
- Misses       1588     2031     +443     

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[github-actions]

💚 All backports created successfully

Status	Branch	Result
✅	v4.5

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