Do not rely on autoincremental ids in materialized path tests

[franmomu]

First of all, I'm not sure if this is the right change, I'm not familiarized with materialized path, I've seen is that it stores the ids in the path, since we cannot rely on the autoincremental ids, this PR finds the root node of a particular node and compares that their treeNodeValue are the same.

This tries to fix the remaining failing test when using doctrine/orm 2.16.2

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.32% 🎉

Comparison is base (98ebb3f) 79.23% compared to head (915f482) 79.55%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2684      +/-   ##
==========================================
+ Coverage   79.23%   79.55%   +0.32%     
==========================================
  Files         161      161              
  Lines        8412     8412              
==========================================
+ Hits         6665     6692      +27     
+ Misses       1747     1720      -27     

see 1 file with indirect coverage changes

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[phansys]

Thanks @franmomu!