[projmgr] Add list packs --locked option

[grasci-arm]

Address #2334

[github-actions]

Test Results

    3 files     21 suites   14m 24s ⏱️
  445 tests   445 ✅ 0 💤 0 ❌
1 335 runs  1 335 ✅ 0 💤 0 ❌

Results for commit 4016567.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.43%. Comparing base (c55093d) to head (4016567).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2342   +/-   ##
=======================================
  Coverage   64.43%   64.43%           
=======================================
  Files         145      145           
  Lines       25997    26006    +9     
  Branches    15666    15673    +7     
=======================================
+ Hits        16750    16757    +7     
+ Misses       7083     7076    -7     
- Partials     2164     2173    +9     

Flag	Coverage Δ
projmgr-cov	87.30% <100.00%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
tools/projmgr/include/ProjMgr.h	100.00% <ø> (ø)
tools/projmgr/include/ProjMgrWorker.h	75.86% <ø> (ø)
tools/projmgr/src/ProjMgr.cpp	80.31% <100.00%> (+0.05%)	⬆️
tools/projmgr/src/ProjMgrWorker.cpp	88.06% <100.00%> (-0.04%)	⬇️

... and 2 files with indirect coverage changes

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