[projmgr] Check invalid context-set (#1086)

[spcaipers-arm]

Address #1872

[github-actions]

Test Results

    3 files     18 suites   8m 56s ⏱️
  379 tests   379 ✅ 0 💤 0 ❌
1 137 runs  1 137 ✅ 0 💤 0 ❌

Results for commit 2695d5d.

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.01%. Comparing base (936cf7d) to head (2695d5d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/test/src/ProjMgrUnitTests.cpp	80.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1881      +/-   ##
==========================================
+ Coverage   64.99%   65.01%   +0.01%     
==========================================
  Files         163      163              
  Lines       34589    34611      +22     
  Branches    20065    20079      +14     
==========================================
+ Hits        22482    22502      +20     
  Misses       7952     7952              
- Partials     4155     4157       +2     

Flag	Coverage Δ
projmgr-cov	81.78% <90.47%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrWorker.cpp	87.95% <100.00%> (+0.04%)	⬆️
tools/projmgr/test/src/ProjMgrUnitTests.cpp	80.97% <80.00%> (-0.01%)	⬇️