[projmgr] Use check pack-updates instead of check

[jthuangarm]

Fixes

• Check existing csolution projects for potential pack updates  #1830

Changes

• Changed the check command to require a subcommand, currently supporting check pack-updates, and updated command-line parsing and help text to reflect this new structure.

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[github-actions]

Test Results

    3 files     21 suites   16m 3s ⏱️
  461 tests   461 ✅ 0 💤 0 ❌
1 383 runs  1 383 ✅ 0 💤 0 ❌

Results for commit 62ee477.

[brondani]

LGTM

[codecov]

Codecov Report

❌ Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.93%. Comparing base (281a898) to head (62ee477).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/src/ProjMgr.cpp	53.84%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2464      +/-   ##
==========================================
- Coverage   64.94%   64.93%   -0.02%     
==========================================
  Files         145      145              
  Lines       26311    26321      +10     
  Branches    15896    15902       +6     
==========================================
+ Hits        17088    17091       +3     
- Misses       7059     7063       +4     
- Partials     2164     2167       +3     

Flag	Coverage Δ
projmgr-cov	87.90% <53.84%> (-0.07%)	⬇️

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/src/ProjMgr.cpp	86.14% <53.84%> (-0.65%)	⬇️

... and 1 file with indirect coverage changes

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