[projmgr] Extend configurations node for layer discovery

[grasci-arm]

Address #1464

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.10%. Comparing base (9d3bce8) to head (44331cd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1492      +/-   ##
==========================================
+ Coverage   63.09%   63.10%   +0.01%     
==========================================
  Files         162      162              
  Lines       30607    30616       +9     
  Branches    18741    18750       +9     
==========================================
+ Hits        19312    19321       +9     
+ Misses       7532     7527       -5     
- Partials     3763     3768       +5     

Flag	Coverage Δ
buildmgr-cov	74.12% <ø> (ø)
packchk-cov	65.54% <ø> (ø)
projmgr-cov	80.18% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
tools/projmgr/include/ProjMgrParser.h	100.00% <ø> (ø)
tools/projmgr/src/ProjMgrWorker.cpp	86.63% <100.00%> (+<0.01%)	⬆️
tools/projmgr/src/ProjMgrYamlEmitter.cpp	94.31% <100.00%> (+0.07%)	⬆️
tools/projmgr/src/ProjMgrYamlParser.cpp	80.47% <ø> (ø)
tools/projmgr/test/src/ProjMgrWorkerUnitTests.cpp	65.29% <100.00%> (ø)

... and 10 files with indirect coverage changes