[projmgr] Fix path normalization

[spcaipers-arm]

Address #1779

[github-actions]

Test Results

    3 files     18 suites   8m 36s ⏱️
  376 tests   376 ✅ 0 💤 0 ❌
1 128 runs  1 128 ✅ 0 💤 0 ❌

Results for commit df097d6.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.96%. Comparing base (28264fc) to head (df097d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1877   +/-   ##
=======================================
  Coverage   64.96%   64.96%           
=======================================
  Files         163      163           
  Lines       34566    34573    +7     
  Branches    20054    20058    +4     
=======================================
+ Hits        22455    22462    +7     
  Misses       7956     7956           
  Partials     4155     4155           

Flag	Coverage Δ
projmgr-cov	81.71% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrWorker.cpp	87.91% <100.00%> (+<0.01%)	⬆️
tools/projmgr/src/ProjMgrYamlEmitter.cpp	94.60% <100.00%> (+0.04%)	⬆️