[projmgr] Preserve west groups in cbuild.yml (#1362)

[grasci-arm]

No description provided.

[github-actions]

Test Results

    3 files     21 suites   13m 34s ⏱️
  430 tests   430 ✅ 0 💤 0 ❌
1 290 runs  1 290 ✅ 0 💤 0 ❌

Results for commit deaa9dd.

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.23%. Comparing base (257cb36) to head (deaa9dd).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/src/ProjMgrCbuild.cpp	86.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2290   +/-   ##
=======================================
  Coverage   66.23%   66.23%           
=======================================
  Files         181      181           
  Lines       36324    36324           
  Branches    22527    22531    +4     
=======================================
  Hits        24060    24060           
+ Misses       7655     7654    -1     
- Partials     4609     4610    +1     

Flag	Coverage Δ
projmgr-cov	80.30% <89.47%> (ø)

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

Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrYamlEmitter.cpp	94.59% <100.00%> (+1.91%)	⬆️
tools/projmgr/src/ProjMgrCbuild.cpp	93.18% <86.66%> (-0.38%)	⬇️

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