[projmgr] Reduce severity of missing dbgconf from error to warning (#1359)

[grasci-arm]

Address Open-CMSIS-Pack/cmsis-toolbox#469

[github-actions]

Test Results

    3 files     21 suites   14m 8s ⏱️
  431 tests   431 ✅ 0 💤 0 ❌
1 293 runs  1 293 ✅ 0 💤 0 ❌

Results for commit fa64429.

[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.24%. Comparing base (257cb36) to head (fa64429).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/test/src/ProjMgrUnitTests.cpp	68.75%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2289   +/-   ##
=======================================
  Coverage   66.23%   66.24%           
=======================================
  Files         181      181           
  Lines       36324    36343   +19     
  Branches    22527    22540   +13     
=======================================
+ Hits        24060    24074   +14     
  Misses       7655     7655           
- Partials     4609     4614    +5     

Flag	Coverage Δ
projmgr-cov	80.29% <76.19%> (-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	88.10% <100.00%> (+<0.01%)	⬆️
tools/projmgr/test/src/ProjMgrUnitTests.cpp	79.10% <68.75%> (-0.04%)	⬇️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.