[projmgr] Skip writing cbuild-pack when csolution is not correctly parsed (#1099)

[spcaipers-arm]

Address #1900

[jkrech]

LGTM

[github-actions]

Test Results

    3 files     18 suites   8m 49s ⏱️
  381 tests   381 ✅ 0 💤 0 ❌
1 143 runs  1 143 ✅ 0 💤 0 ❌

Results for commit fd5bbdb.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.15%. Comparing base (a6e568a) to head (fd5bbdb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1902   +/-   ##
=======================================
  Coverage   65.14%   65.15%           
=======================================
  Files         173      173           
  Lines       34831    34833    +2     
  Branches    20215    20216    +1     
=======================================
+ Hits        22692    22694    +2     
  Misses       7961     7961           
  Partials     4178     4178           

Flag	Coverage Δ
projmgr-cov	81.86% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrCbuildPack.cpp	100.00% <100.00%> (ø)