[projmgr] Fix clean-up for successive RPC ConvertSolution calls

[grasci-arm]

No description provided.

[github-actions]

Test Results

    3 files     21 suites   13m 33s ⏱️
  430 tests   430 ✅ 0 💤 0 ❌
1 290 runs  1 290 ✅ 0 💤 0 ❌

Results for commit c623770.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.23%. Comparing base (fbf59d7) to head (c623770).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/test/src/ProjMgrWorkerUnitTests.cpp	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2279   +/-   ##
=======================================
  Coverage   66.23%   66.23%           
=======================================
  Files         181      181           
  Lines       36312    36320    +8     
  Branches    22521    22524    +3     
=======================================
+ Hits        24050    24057    +7     
- Misses       7668     7679   +11     
+ Partials     4594     4584   -10     

Flag	Coverage Δ
projmgr-cov	80.30% <90.00%> (+<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/include/ProjMgrWorker.h	75.86% <100.00%> (ø)
tools/projmgr/src/ProjMgr.cpp	80.18% <100.00%> (+0.02%)	⬆️
tools/projmgr/src/ProjMgrWorker.cpp	88.10% <100.00%> (+<0.01%)	⬆️
tools/projmgr/test/src/ProjMgrWorkerUnitTests.cpp	65.56% <75.00%> (+0.03%)	⬆️

... and 2 files with indirect coverage changes

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