tests/nested/manual/hybrid-remodel: use fakestore

[valentindavid]

Cherry pick of #14817

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.22%. Comparing base (24a0034) to head (400dc31).
Report is 84 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14904      +/-   ##
==========================================
+ Coverage   78.20%   78.22%   +0.01%     
==========================================
  Files        1151     1153       +2     
  Lines      151396   152762    +1366     
==========================================
+ Hits       118402   119491    +1089     
- Misses      25662    25891     +229     
- Partials     7332     7380      +48     

Flag	Coverage Δ
unittests	78.22% <ø> (+0.01%)	⬆️

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